Chicken & egg situation caused by system & recovery SKU mismatch from the factory - Asus Zenfone Max Questions & Answers

Chicken & egg situation caused by system & recovery SKU mismatch from the factory
Hi All,
I've been stuck on this for 2 days now and I thought maybe it would be quicker for someone here to point me in the right direction.
This thread isn't for my model of phone but it does help explain my problem in the most clear way.
https://www.asus.com/zentalk/thread-14962-1-1.html
This is what I have:
Asus Zenfone Max ZC550KL
- Z010D
- 8916
- 410
- 2GB
- CN Recovery
- WW System
The phone is stuck on android 5.0.2 and never received the OTA updates. or it did, but failed. I think the reason the phone has so many issues with updates is because the supplier of the phone side loaded the WW system image on top of a CN recovery. Apparently this is a no no.
So now I'm trying to fix the problem but I seem to be trapped in a chicken and egg type situation. I need to change the recovery firmware from CN to WW. To change the recovery firmware I first need to unlock the boot loader. When I try to install the unlock boot loader apk through adb it says "[INSTALL_FAILED_OLDER_SDK]". To unlock the boot loader I need to first update android. But I can't update android over OTA because that isn't working. I also can't update the firmware by copying the latest version from asus (8916-13.8.26.110) to the SD card because android doesn't notify me that it has found this update in the root directory. I can't even update the firmware by pushing it through adb. It says something like 'Can't install WW firmware on a CN phone'. Lastly I have also tried using the ASUS flash tool but that was unable to extract the firmware.zip. Apparently I need a raw firmware zip for aft to work but those are hard to come by.
I'm thinking my only option would be to either find an Asus boot loader unlocker that works on android 5.0.2 and the Z010D. Anyone know if this exists?
or force the normal asus boot loader unlocker to install on android 5.0.2. Anyone know if this is possible?
or find a raw firmware zip for the z010d to flash using AFT. Anyone seen this?
Any other suggestions?
Edit: I figured it out. Follow the instructions for using AFT here https://ainotech.com/how-to-flash-firmware-asus-zenfone-max-zc550kl-root-custom-twrp-recovery/
I used AFT v0.34 because the newer versions either couldn't see my phone or couldn't handle the zip file.
I also flashed the old v12 firmware they have listed because I couldn't find a newer version in raw format. (AFT requires raw zips). But it doesn't really matter if it's an old version because once AFT has flashed the WW recovery, you can freely update to whatever WW version you want using traditional methods. I didn't even manage to get that version running because of boot loops. But the recovery works perfectly. From there it was simply a matter of downloading the v13 zip from the asus website and flashing it from the recovery menu.

Related

Help upgrading to .87 firmware

Hey guys, i am trying to upgrade my zf5 from ww.79 to ww.87, but it always give the following error:
E: cant check the whole file signature
Signature veerification failed
Aborting blablabla.
Ive tryed so many ways, several times (adb sideload, putting zip on internal storage)
What could it be? bad zip file?
Additional infos:
I had xposed, root and twrp, but ive unninstalled it all before trying to update.
alredy did factory reset/fullwipe
Flashed recovery image from the .87 zip.
Thanks in advance, and sorry for the disgusting english.
Try to flash stock .87 boot and recovery img and after flash the rom
Ghi98 said:
Try to flash stock .87 boot and recovery img and after flash the rom
Click to expand...
Click to collapse
Just tried it, with zip on root directory, it showed the update, but when applied, my android shut down and didnt boot to recovery.
when i hit the power button, it showed that usb logo, and then it turned red and didnt boot.
i had to enter recovery manually, then the update has begun. but got the same error. i think that i'll have to downgrade, to overwrite all old data (maybe some register that i had twrp, root and other things installed) and then update again.
omg, i'm going crazy with this.
I think you need to redownload the .zip file.
The file you downloaded was corrupted
Asus Zenfone 5 WW 3.24.40.87 FW: dlcdnet.asus.com/pub/ASUS/ZenFone/A500CG/UL-ASUS_T00F-WW-3.24.40.87-user.zip
Long Çhïvaš said:
I think you need to redownload the .zip file.
The file you downloaded was corrupted
Asus Zenfone 5 WW 3.24.40.87 FW: dlcdnet.asus.com/pub/ASUS/ZenFone/A500CG/UL-ASUS_T00F-WW-3.24.40.87-user.zip
Click to expand...
Click to collapse
yay, i'm trying to downgrade it and re upgrade. if it does not work i will re-download the file. but the problem is, i dont have internet at my home, only 3g, and my daily limit is 200mb :crying:
ive tryed appliying update via twrp a few minutes ago, it said that my SKU is different from the updates sku. and showed a null value for my sku (somethink like : current sku: Zip sku: ww)
maybe thats the point. some bug that the tons of mods that i have installed corrupted something in my system.
thanks for helping me guys .
oh god, just in time, the downgrade zip failed too:
Installing update...
Device image sku: ww
OTA image sku: WW
only android 5.0 image could downgrade with this script.
i give up, i'll die with .78 firmware in my phone.
jemilazzy said:
yay, i'm trying to downgrade it and re upgrade. if it does not work i will re-download the file. but the problem is, i dont have internet at my home, only 3g, and my daily limit is 200mb :crying:
ive tryed appliying update via twrp a few minutes ago, it said that my SKU is different from the updates sku. and showed a null value for my sku (somethink like : current sku: Zip sku: ww)
maybe thats the point. some bug that the tons of mods that i have installed corrupted something in my system.
thanks for helping me guys .
oh god, just in time, the downgrade zip failed too:
Installing update...
Device image sku: ww
OTA image sku: WW
only android 5.0 image could downgrade with this script.
i give up, i'll die with .78 firmware in my phone.
Click to expand...
Click to collapse
You need to flash the recovery image via fastboot/droidboot before downgrading.
Since your recovery is TWRP it ain't allowing you to do so, or to be more specific you cannot do it.. It has to be done via stock recovery.. Get the recovery flashed back to stock and then give it a shot...
try to flash stock recovery from .78 and relock your bootloader
:angel:
Gdadelha , guinzon and junamax
I just tried via twrp, only after stock has failed, it was just an "why not" try.
Ive relocked and changed everything to stock before doing it first time. :/

Trying to flash Cyanogen 12.1 to Asus Zenfone 2 Laser ZE551KL Z00TD

I'm trying to flash CM 12.1 to my ZE551KL. I have the most recent nightly and the gapps zips. I tried to flash the ROM and kept getting a signature not verified error that I forget the exact wording of. I researched a bit and concluded that I need to unlock the boot loader. So here's where the problem starts. Asus makes a boot loader that will work on my phone but requires firmware 1.16.40.763. My phone won't update past 1.15 something. And that's odd to me since I just got it yesterday.
I tried to use the Asus boot unlocker anyway but nothing happened because my phone won't update to firmware 1.16.40.763. I saw a firmware update to 1.16.40.763 on the Asus website for the Z00T. I have the Z00TD. Will the Z00T firmware brick my phone or work on my phone? My thought it that if it works I can run the boot unlocker that requires 1.16.40.763 and then with the boot loader unlocked I should stop receiving the signature invalid error when I try to flash CM12.1. Does that sound about right? This is my first time flashing CM myself.
Thank you for your help and thoughts.
You should only flash a ROM that's made specifically for your device.
It's actually a good thing for you that it did not flash.
http://wiki.cyanogenmod.org/w/Unofficial_Ports#Asus - Zenfone 2 Laser is not in the cyanogenmod list.
David McDavid said:
I'm trying to flash CM 12.1 to my ZE551KL. I have the most recent nightly and the gapps zips. I tried to flash the ROM and kept getting a signature not verified error that I forget the exact wording of. I researched a bit and concluded that I need to unlock the boot loader. So here's where the problem starts. Asus makes a boot loader that will work on my phone but requires firmware 1.16.40.763. My phone won't update past 1.15 something. And that's odd to me since I just got it yesterday.
I tried to use the Asus boot unlocker anyway but nothing happened because my phone won't update to firmware 1.16.40.763. I saw a firmware update to 1.16.40.763 on the Asus website for the Z00T. I have the Z00TD. Will the Z00T firmware brick my phone or work on my phone? My thought it that if it works I can run the boot unlocker that requires 1.16.40.763 and then with the boot loader unlocked I should stop receiving the signature invalid error when I try to flash CM12.1. Does that sound about right? This is my first time flashing CM myself.
Thank you for your help and thoughts.
Click to expand...
Click to collapse
Where did you download the CM-12 ROM? Are you sure it's for the ZE551KL?
I'm on the same firmware and the bootloader unlock apk does work, though it leaves no indication after the phone restarts. My guess is that you're phone is bootloader unlocked just fine, but you're trying to flash a rom that wasn't built for ZE551KL (Z00TD).
I'm assuming all of you have already rooted your device and was wondering if you can point me to the files needed so that I can root my Z00TD (ZE551KL)..just got this phone yesterday and switched from a lgg3. Have been looking everywhere and can't seem to find the files needed for thiss specific device..thanks
tmjm28 said:
I'm assuming all of you have already rooted your device and was wondering if you can point me to the files needed so that I can root my Z00TD (ZE551KL)..just got this phone yesterday and switched from a lgg3. Have been looking everywhere and can't seem to find the files needed for thiss specific device..thanks
Click to expand...
Click to collapse
HampTheToker wrote up a nice tutorial fro the ZE551KL:
http://forum.xda-developers.com/showpost.php?p=65264766&postcount=7

[HELP] Need Expert Help! Asus Zenfone 5 LTE (A500KL)

First of all, I wanted to apologize if I'm posting at a wrong section but please do move this thread if necessary.
Second, I know some of you have already read a bunch of problems regarding to this model of zenfone 5 but I'm still hoping that one day someone can help us A500KL users. I've spent sleepless nights browsing the internet for solutions. I've been through different websites like taiwanese, chinese, russian and many more but still can't seem to find any guides or solution to my problem.
The thing is, one day after booting my phone and making it to home screen a few seconds later it's restarting on it's own. restarted and same thing happened over and over again. I didn't mind losing my files so i went to recovery to do a factory reset hoping it will resolve the problem. But the moment I press enter, a bunch of errors saying E:failed to mount...... (invalid argument) showed up. It failed wiping to factory reset. i tried wiping cache but still gets a bunch of those error. I know little about flashing so I came to a place where they said that i have to download the stock firmware from asus website with the same version and same SKU. so i did that and stored the stock rom on my external SD card (can't save in internal since I can't boot to homescreen anymore. Just ending up in Asus logo loading forever.) but still no luck. I Searched some more and found a guide about flashing using AFT. I tried but still no luck, says it needs a .raw firmware. unfortunately anywhere i go there is no .raw firmware for my phone. so I explore some more and came across about bootloader. but recently i found out that my bootloader is locked. Neither can I flash using sideload.
My phone is not rooted, no custom recovery installed, no option to install update from ADB and can't install from recovery. BUT still able to go to recovery, boot until asus logo, when charging battery icon still shows. still vibrates when powered.
I really hope someone out there can help me with my current problem. I still think this can be done cause i don't think theres a problem with the hardware. Been searching for days and I really need to recover my phone. Oh and not to mention there are 2 more of this phone on my relatives and all of them have the same problem. So please help us A500KL users. Sorry for the long message, I'm just so desperate to recover my phone. God Bless
hi bro
well firstly bootloader unlock is NOT needed for sideloading stock firmware.i'm giving you the link to one of my tutorials,follow the procedure carefully.note one thing that do NOT download the firmware whose link is given in tutorial,instead use kitkat firmware of your phone(download from asus support page)....use only kitkat firmware pls.coz my experience says that flashing lollipop directly gives errors.http://forum.xda-developers.com/zenfone-5/help/bootlooped-bricked-returning-to-stock-t3358662
[email protected] said:
hi bro
well firstly bootloader unlock is NOT needed for sideloading stock firmware.i'm giving you the link to one of my tutorials,follow the procedure carefully.note one thing that do NOT download the firmware whose link is given in tutorial,instead use kitkat firmware of your phone(download from asus support page)....use only kitkat firmware pls.coz my experience says that flashing lollipop directly gives errors.http://forum.xda-developers.com/zenfone-5/help/bootlooped-bricked-returning-to-stock-t3358662
Click to expand...
Click to collapse
That method only work for A500/501 cg models. Not A500KL .It will not work. I already came across this problem. There is NO RAW FIRMWARE FOR ZENFONE 5 LTE
ChristopherXI said:
That method only work for A500/501 cg models. Not A500KL .It will not work. I already came across this problem. There is NO RAW FIRMWARE FOR ZENFONE 5 LTE
Click to expand...
Click to collapse
but when did i say that you need raw firmware??
what we are doing is flashing fastboot,recovery and then sideloading the zip firmware which is available on asus website...
[email protected] said:
hi bro
well firstly bootloader unlock is NOT needed for sideloading stock firmware.i'm giving you the link to one of my tutorials,follow the procedure carefully.note one thing that do NOT download the firmware whose link is given in tutorial,instead use kitkat firmware of your phone(download from asus support page)....use only kitkat firmware pls.coz my experience says that flashing lollipop directly gives errors.http://forum.xda-developers.com/zenfone-5/help/bootlooped-bricked-returning-to-stock-t3358662
Click to expand...
Click to collapse
Hello bro.. your tutorial is well said but unfortunately Zenfone 5 LTE is different. Yes i do have a firmware downloaded at the official asus website and it doesn't contain any recovery.img and fastboot.img there's only boot.img inside. and yes its only kitkat. its WW 11.4.6.94
Lastly, zenfone 5 LTE doesn't have "apply update from ADB" option in recovery by default so sideloading is not really possible. I can only depend on fastboot with locked bootloader. so yeah that makes things difficult.
[email protected] said:
but when did i say that you need raw firmware??
what we are doing is flashing fastboot,recovery and then sideloading the zip firmware which is available on asus website...
Click to expand...
Click to collapse
You din't get what i mean.... His system partition is MESSED UP. The partition also contains fastboot and recovery partition. Flashing fastboot and recovery WILL FAIL. He will have to find AND RAW FIRMWARE NOT A ZIP FIRMWARE FROM ASUS.
I already searched for Raw firmware for zenfone 5 lte. There is no raw firmware for that model. Using that guide requires the raw firmware. In the process that tool will use the RAW firnware to fix the partition table.
Hopes that clears everything up
Hi Bazerald,
My 18-month old A500KL has exactly the same problem as you had described - startup never get pass the Asus logo screen, got a bunch of "E: failed to mount ....." error messages in Recovery. I was told by the Asus Service Centre technician that the problem was caused by a broken ROM and to revive the phone, a replacement of the mother board was required and they were charging megabuck for the job. I ended up taking my phone back without fixing and here I am browsing in this forum hoping to find an alternative solution.
Since I know everything else on my A500KL is still working except the internal ROM, what I am hoping to do is to find if there is a way to load the stock firmware onto an external SD card and boot up the phone from there, in other words, I would like to swap the internal and external memory. I can find a few discussions on this topic for the Samsung Galaxy, but I have yet to find a viable solution for our A500KL.
Any member has any suggestion on this idea?
ChristopherXI said:
You din't get what i mean.... His system partition is MESSED UP. The partition also contains fastboot and recovery partition. Flashing fastboot and recovery WILL FAIL. He will have to find AND RAW FIRMWARE NOT A ZIP FIRMWARE FROM ASUS.
I already searched for Raw firmware for zenfone 5 lte. There is no raw firmware for that model. Using that guide requires the raw firmware. In the process that tool will use the RAW firnware to fix the partition table.
Hopes that clears everything up
Click to expand...
Click to collapse
hi friend
i'm really sorry,i just somehow missed the line saying that he has system error..
thanks for noting
Toki Yoki said:
Since I know everything else on my A500KL is still working except the internal ROM, what I am hoping to do is to find if there is a way to load the stock firmware onto an external SD card and boot up the phone from there, in other words, I would like to swap the internal and external memory. I can find a few discussions on this topic for the Samsung Galaxy, but I have yet to find a viable solution for our A500KL.
Any member has any suggestion on this idea?
Click to expand...
Click to collapse
I agree, I was hoping for the same thing here since xda is very popular for fixing tons of problems. I guess we'll just have to wait for THE ONE who can help us.. since A500KL doesn't seem have a raw firmware I'll be very happy if anyone can spend a time and make a raw firmware for us (if it's possible). Recovering the 3 A500KL here will be very rewarding.
Also, I'm trying to not depend too much on the raw firmawre cause the main reason is the messed up partition. Still searching for a way to fix it manually and getting some ideas on how it is done on other phones.
Unless you guys found a RAW firmware for the LTE model. It's preety much hopeless. Sorry........
does anyone know if repartitioning the messed up partition of A500KL manually is possible?
I got the same problem a few months ago. I searched through the Internet and found that many many people having such problem, I concluded that it is the quality of the chips (usually 15 months of usage), not software problem alone (the phone just died suddenly, I did nothing at all!!). This was the first time I had hardware failure in phones (in the past 20 years!). I WILL NEVER BUY ASUS phone again.
Ok guys, give me a sec and i'll find the firmware. Theres one on the website thats a revert firmware that will fix it. I had the same issue with mine. This firmware will revert it back to Kitkat. Yes.. Its DOES have the stock Recovery,Boot.img and System.img files.
This is the firmware your looking for Version WW_11.4.6.94 (Downgrade Version)
http://www.asus.com/us/support/Download/39/1/0/6/8/
ONLY FLASH THAT VERSION! Only Version WW_11.4.6.94 (Downgrade Version) (WorldWide) Version..
Only the Downgrade Versions have the complete files needed to repair a bad flash or root attempt.
Follow the directions Vaib posted on the previous page, but use the firmware file above.
Should fix the software,recovery and partition issue. Also, the bootloader unlock provided by Asus is hit and miss.
I've used it to root,but alot of the files are interlinked. So you run the risk of another app not working when trying to debloat the rom. As of now there is no Alternate non Stock Rom for the A500KL. Note: After flashing the WW firmware you phone will be recognized as an Asus "T00P". This is normal and doesnt cause any issues.
If all else fails, go here for more info on the A500KL. http://www.asus-zenfone.com/search/label/Zenfone 5 LTE
Good Luck. Happy Flashing
TabascoTX said:
Ok guys, give me a sec and i'll find the firmware. Theres one on the website thats a revert firmware that will fix it. I had the same issue with mine. This firmware will revert it back to Kitkat. Yes.. Its DOES have the stock Recovery,Boot.img and System.img files.
This is the firmware your looking for Version WW_11.4.6.94 (Downgrade Version)
http://www.asus.com/us/support/Download/39/1/0/6/8/
ONLY FLASH THAT VERSION! Only Version WW_11.4.6.94 (Downgrade Version) (WorldWide) Version..
Only the Downgrade Versions have the complete files needed to repair a bad flash or root attempt.
Follow the directions Vaib posted on the previous page, but use the firmware file above.
Should fix the software,recovery and partition issue. Also, the bootloader unlock provided by Asus is hit and miss.
I've used it to root,but alot of the files are interlinked. So you run the risk of another app not working when trying to debloat the rom. As of now there is no Alternate non Stock Rom for the A500KL. Note: After flashing the WW firmware you phone will be recognized as an Asus "T00P". This is normal and doesnt cause any issues.
If all else fails, go here for more info on the A500KL. http://www.asus-zenfone.com/search/label/Zenfone 5 LTE
Good Luck. Happy Flashing
Click to expand...
Click to collapse
Tabasco , WW_11.4.6.94 (Downgrade Version) did not have recovery.img and fastboot.img inside as well.
kenooi1984 said:
Tabasco , WW_11.4.6.94 (Downgrade Version) did not have recovery.img and fastboot.img inside as well.
Click to expand...
Click to collapse
It should have, unless i accidentally linked to the wrong one. Let me see what happened.
The downgrade version should have recovery and fast-boot. It kicks it from L to KK. Since the fast-boot and recovery aren't compatible from L to KK, it should flash it. When i boot looped mine trying to a flash an alternate recovery i re-flashed using the downgrade version to fix it. I guess possibility that it could be in another WW Version, but im pretty sure i remember flashing the first WW Downgrade. I'm going to look at WW_11.4.6.71 and see if it in there.
OK, WW_11.4.6.71 has a script to install recovery. So the recovery.img is in the firmware somewhere. Try WW_11.4.6.71 instead and see if that fixes it for you.
TabascoTX said:
It should have, unless i accidentally linked to the wrong one. Let me see what happened.
The downgrade version should have recovery and fast-boot. It kicks it from L to KK. Since the fast-boot and recovery aren't compatible from L to KK, it should flash it. When i boot looped mine trying to a flash an alternate recovery i re-flashed using the downgrade version to fix it. I guess possibility that it could be in another WW Version, but im pretty sure i remember flashing the first WW Downgrade. I'm going to look at WW_11.4.6.71 and see if it in there.
Click to expand...
Click to collapse
thanks for tried to check , i downloaded WW-11.4.6.107 it did not have it either.
due to my super slow internet speed ,it took me abt 3 hours to downloaded 1 firmware....... i wish to download all to check but...... poor me..
kenooi1984 said:
thanks for tried to check , i downloaded WW-11.4.6.107 it did not have it either.
due to my super slow internet speed ,it took me abt 3 hours to downloaded 1 firmware....... i wish to download all to check but...... poor me..
Click to expand...
Click to collapse
OK, WW_11.4.6.71 has a script to install recovery. So the recovery.img is in the firmware somewhere. Try WW_11.4.6.71 instead and see if that fixes it for you.
The recovery isnt exactly named recovery.img, there's a script that refers to installing the recovery from another location. So i'd try flashing the downgrade version after getting the phone into fastboot. And unfortunately it can be difficult to tell if the phone is actually in fastboot.
TabascoTX said:
OK, WW_11.4.6.71 has a script to install recovery. So the recovery.img is in the firmware somewhere. Try WW_11.4.6.71 instead and see if that fixes it for you.
Click to expand...
Click to collapse
ok thanks , will try it later on.
Wow.
You people really didn't read the comments section throughly.
Trying normal or downgrade firmware will not work.
This procedure requires a RAW firmware.
And using the offline update tool provided by @dgadelha.
If any of you found a RAW firmware for the A500KL model.
You can easily adapt the script from his Offline update tool.
It will repartition the device.
AGAIN. trying normal firmware is not going to fix the problem
@Bazerald (i think that your a500kl is WW) Try: with stock recovery try wipe the phone (data, cache), flash the firmware downloadable from asus site UL-ASUS_T00P-WW-11.4.6.94-user, (not the downgrade version), if not success, try UL-ASUS_T00P-WW-12.4.5.22

System update failed

Today I tried to update my firmware to 13.10.10.34.
The phone rebooted and then it told me that the update failed.
Now it does not offer the update anymore.
How can I update the firmware?
I have rooted ZE500KL with 13.10.7.1(Andriod M).
I'm having the same problem similar as above. I have lost the TWRP and seems like have no stock recovery as well. I have this problem right after attempting to install stock recovery using flashify. I guess i have installed the wrong version of stock recovery and right after the boot up, i never had any chances to see the recovery window (power button + volume down). It's only stuck at Asus logo. Please anyone help me!
Download and flash official recovery,go into recovery and wipe data and cache partition,download latest firmware from official asus site and in recovery select adb sideload and from adb write adb sideload name_of_firmware.zip reboot,wait 10-15min. And enjoy?
Hi im having asus zenfone 2 laser ZE550KL , few days before i got a update notification for 150 mb i updated it but after updated mobile is shut down and restarted and open with aa black colpur html format program that contains reboot ppwer off etc
Can u tell what i want to do for getting update??
blackholeredstar said:
Today I tried to update my firmware to 13.10.10.34.
The phone rebooted and then it told me that the update failed.
Now it does not offer the update anymore.
How can I update the firmware?
I have rooted ZE500KL with 13.10.7.1(Andriod M).
Click to expand...
Click to collapse
As you have already rooted your phone, I'd suggest you to flash a custom ROM as you can get Nougat and they are much better than stock Asus ROMs.
But if you want to update, download it from official Asus website and flash it from recovery mode.

Help me Zenfone 2 laser ZE500KG Bootloop!!!!!

my zenfone 2 laser is bootloop! (ZE500KG)
I try flash file TWRP but I can't do that!
It say ''Failed'' > '' zip verification failed''
anyone know how to fix it faulty?
TWRP 3.0.2-0 (TeamWin) for zenfone 2 laser!
ALSO DO NOT FLASH WITH ADB! Help me. :crying::crying::crying::crying::crying:
Hey,I dont know if u found the answer yet
TWRP can just flash unofficial rom
not official rom
if you want official rom
you have to use oem recovery...not twrp
I m look for answer too...that is all i know
TWRP can install both Stock Or Custom Roms...it is based upon the update-script...
I had an issue where I could install any of the cyanogenmod 13 nightly updates past June 14th on my phone, a ze551kl. I resolved the issue by updating to the OEM ROM 21.40 from the Asus website. Hopefully this is helpful.
I downloaded the following files from the?*Asus website and copied them into the?*SD Card?*of my phone:
- UL-Z00T-WW-1.16.40.763-user.zip
- UL-Z00T-WW-1.17.40.1234-user.zip
- UL-Z00T-WW-21.40.1220-1615-user.zip
- UL-Z00T-WW-21.40.1220-1794-user.zip
I then used fastboot to install the stock recovery image. After installing the stock recovery, I rebooted into recovery mode and installed 1.16 and restarted the phone. After the phone booted into 1.16, I rebooted into recovery and installed 1.17, etc . . . until I updated to 21.40.1220-1794.
After the last update, I replaced the stock recovery with TWRP and l was able to install the latest nightlies. It seems like installing 21.40 was the key to fixing this issue.
An important side note : I downloaded the WW ROMs because my phone is a WW region. If your phone is from a different region, you will need to download the appropriate ROMs.
Good luck with your phone.

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