Database Users

[Q] Nexus 7 doesn't boot

Hello all! I'm having a problem with a Nexus 7.
This is my brother's tablet that he hasn't used in a few months. It hasn't been unlocked or rooted.
I can get to the boot screen with the android lying on it's back and the options with the volume buttons. The other info on that screen which might be pertinent:
Fastboot mode
Product name: grouper
variant - grouper
hw version - er3
bootloader version - n/a
serial number -
signing - not defined yet
lock stated - locked
When I go to recovery mode and push the power button, it says "booting failed" in the upper left. It still says Google in the middle, and has the options with the volume in the upper right, but the android is gone as is the text in the lower left.
I have adb and fastboot installed, but I can't seem to do much since the tablet is locked. I tried unlocking a few times, and it's always failed. Usually it doesn't give a reason, but one time I got this: "Failed (status read failed (Too many links))"
I've tried googling this and can't find someone with the same problem.
Anything I can try?
Thanks!

Nexus Tool Kit

rbeavers said:
Nexus Tool Kit
Click to expand...
Click to collapse
OK, I have that now, but I can't get very far. I think I need to enable debugging on the device first? How can I do that in that state it's in now?

swirv81 said:
OK, I have that now, but I can't get very far. I think I need to enable debugging on the device first? How can I do that in that state it's in now?
Click to expand...
Click to collapse
Anything else I can try? Not sure if I'm missing something with the tool kit, but I nothing I tried seemed to help.

swirv81 said:
Anything else I can try? Not sure if I'm missing something with the tool kit, but I nothing I tried seemed to help.
Click to expand...
Click to collapse
If you can get into the Bootloader, just run the below via ADB
Code:
fastboot oem unlock
Once you unlock the Bootloader you can use the "Soft Brick" Mode in the NRT to Re-flash back to stock and see if that will allow you to boot. You do not need debugging enabled to use the Nexus Root Toolkit if you use the Soft Brick mode, but you must have an unlocked bootloader.

ariesgodofwar said:
If you can get into the Bootloader, just run the below via ADB
Code:
fastboot oem unlock
Once you unlock the Bootloader you can use the "Soft Brick" Mode in the NRT to Re-flash back to stock and see if that will allow you to boot. You do not need debugging enabled to use the Nexus Root Toolkit if you use the Soft Brick mode, but you must have an unlocked bootloader.
Click to expand...
Click to collapse
I've tried unlocking a few times, but after a few minutes of it saying "unlocking" it fails.

swirv81 said:
I've tried unlocking a few times, but after a few minutes of it saying "unlocking" it fails.
Click to expand...
Click to collapse
What says "unlocking" (computer or tablet) and are you trying to do it through the Toolkit, or via command prompt ADB? I would first make sure your computer is seeing your tablet (ie. that the drivers and Fastboot are installed correctly). Do you know that they are?

ariesgodofwar said:
What says "unlocking" (computer or tablet) and are you trying to do it through the Toolkit, or via command prompt ADB? I would first make sure your computer is seeing your tablet (ie. that the drivers and Fastboot are installed correctly). Do you know that they are?
Click to expand...
Click to collapse
I was trying this with the command prompt. I could get fastboot to list the device when using that command. And the tablet and command prompt both say "unlocking" when doing that. I would assume that means the computer is seeing the tablet and everything is set up correctly?
I think I tried to unlock with the Toolkit, but I believe it told me that device needs to be in debugging mode.

Hey there, I'm having a similar problem.
My info is the same except my bootloader version is 4.18 and my lock state says it's unlocked. I tried to use the root kit but I'm having trouble with the fastboot device being detected. Driver solutions attempted were the google ones, and the pdanet ones. I can't really do the manual thing since that involves the device being recognized when plugged in, and since I can't enable usb debugging... anyways the automated drivers windows says were installed successfully so I don't really know what else to do.
Note: I do know the usb port on the tablet and computer work since when plugged in, it will show that its charging with the white battery icon.

Same issue here
I was in the process of upgrading manually from android 5.0 to 5.0.2 owing to the serious lag that came with lollipop. The OTA was taking longer and testing my patience as most apps were crashing due to lag.
Therefore decided to go for manual flashing of the image. I have never done this before. I was able to make the computer see my device by disabling mtp via storage under setting in the device. This is one thin I noticed to make the device visible to the computer.
After installing the device drivers my nexus was visible within the device manager but it couldn't be seen as an external storage until I played with the MTP. I had even unlocked the boot loader before all this.
So everything was going well and while I started to think all is well, I ran into this issue. From adb I tried to run 'flash-all.bat' from the new device image. Something went wrong somewhere - don't know what it is, but from then on, I am stuck in the fastboot screen or into recovery mode but when i try to boot the device bu hitting the power button - I get this message 'Booting failed'.
I am also trying to use NRToolkit but no use. When I connect my device it is seen in the device manager in my pc but cannot see it as a storage. Therefore when I now try to run the 'adb devices' command it cannot see my device. From what I saw initially, until I enable/disable mtp mode adb was not able to see my device to communicate.
Now when I tried NRT and installed the drivers once again, it is being detected in the device manager but when I run the driver test within NRT - I get a ADB device not found error. Within NRT all that it says is go into device setting>storage to enable it which I know but at the current status of my device in boot screen/recovery mode how can I go in to enable this. This is not helpful.
Somebody please suggest a workaround for this issue. I know I am close to the solution but not sure how to enable the MTP or at least made the NRToolkit to say 'ADB device found'.
My fastboot screen shows these details:
Fastboot mode
Product name grouper
Variant = grouper
HW Version – ER3
Bootloader version – 4.23
Baseband version – N/A
Serial number – 015d21d910141c0a
Signing – not defined yet
Lock State - unlocked
Please help.

[Q] Old Nexus 7, New Issues

Hey guys!
I've been scouring these forums for two days now making sure my specific issue hasn't been discussed and, from what I've seen, I've won some sort of "annoying issue" lottery.
I was handed a Nexus 7 (ME370T) a few days ago and told "if you can fix it, it's yours."
I can get to the bootloader no problem but not the actual OS. Here's the data from the bootloader:
Fastboot Mode
Product Name - grouper
Variant - grouper
HW Version - ER3
Bootloader Version - 4.23
Baseband Version - N/A
Serial Number - xxxxxxxxx
Signing - not defined yet
Lock State - Locked
Long story short, I've installed the Android SDK and when I plug the tablet into my PC, I can see it as "Google Nexus 7 Bootloader Interface"
When I use fastboot devices, it sees the tablet just fine.
When I use adb devices, it doesn't see the tablet.
I've tried fastboot oem unlock and I get a FAILED (remote: (Unknown error code)) error.
I can run the unlock feature through the Nexus Root Toolkit but it reboots to a black screen (my device manager sees it as "Asus Transformer Prime APX Interface")
When I finally get the thing rebooted to the bootloader (manually powering off and then back on), it's still locked.
I have no idea if USB Debugging was turned on or not. I keep reading that, to flash a partition to a new file, the bootloader doesn't need to be unlocked but every single time I try to fun fastboot, i get Failed, Bootloader is locked.
Am I nuts? I know I'm new to this but I'm fairly certain I've done everything right! You guys seem super knowledgeable and I hope you can help me out!
Thanks!

Issue unlocking bootloader on US996

Hello,
I am going through the official way of unlocking the bootloader through developer.lge.com
I am trying to see my device's ID but can't get into boot loader mode
When ever I run "adb reboot bootloader" in CMD I get the message "no device/emulator found"
- OEM unlock is enabled
- USB debugging is enabeled
- I am using LG usb drivers
Did a ton of googling and not sure what else to try.
I wanna root this phone so bad!

Well I was able to get past the ID issue by using a different PC, however once I was able to input my device ID and everything into the LG site, the message I got was this:
Your device (LGUS996Z) does not support unlocking the bootloader. Please check your model. Your account will be locked if you enter the wrong information more than 8 times.
I don't even understand how it's possible if this us a US996.. gonna be pretty upset if I can't unlock the bootloader
What the heck is a LGUS996Z anyway!?
Gonna be really upset if I can't unlock the bootloader
Here's a picture of the model number sticker:
https://www.dropbox.com/s/y64rgsee2rol37a/20180120_024800.jpg?dl=0
pretty sure it isn't the us cellular version

Samsung Drivers Won't Work When In Fastboot Mode

First of all, I would like to point out that the XDA Developers website has made this problem harder than it needed to be. This post is originally from Stack Exchange, but people said I would have more luck here with this problem. But every little thing I do it a problem. Try to use a proxy on the website? Nope. Try to post this in the Samsung Galaxy S7 section, where it's SUPPOSED to be? Nope. I know it's all to prevent spam, but I mean come on. Be a little lenient here. Anyways, I'm done with my rant. Back to the post.
I have made the mistake of trying to root my phone. Which is fine, but it's a lot more complicated than I thought it was, but since I have asperger's, once I start something, I feel like I have to finish it.
I have a Samsung Galaxy S7 (SM-G930U) with Sprint. I've heard that these phones are EXTREMELY difficult to root. Some even call it impossible. But I can at least try.
I ended up getting tunneled down a endless loop of tasks to complete before I actually root my phone, for preparation. One of the things I must complete is I have to install a TWRP Recovery Image in case of failure. But in order to do that, I have to unblock the bootloader.
To do this, I am using Platform Tools, with includes ADB (Android Debugging Bridge), and Fastboot. I connect my phone to my PC via USB cable, open the CMD, and type:
adb reboot bootloader
Once I do this, my phone reboots into the bootloader, just like it should. Normally, the next step I would take would be to type in:
fastboot oem unlock
When I do this, I am left with the message:
< waiting for any device >
I'm assuming that means that it's not detecting my phone at all. It's odd though, because it was able to detect my device perfectly fine whenever my phone was booted normally, but when I go into the bootloader, it doesn't detect my phone anymore.
After hours of searching around the internet, I found that a potential problem could be the drivers of my phone that are installed on my PC.
Sure enough, if I open up the Device Manager, when in the bootloader, under Universal Serial Bus Controllers, I found the driver "SAMSUNG Mobile USB CDC Composite Device", with a little yellow arrow next to it on the icon.
If I double-click on the entry, in the "Device Status" box, it will say:
This device cannot start. (Code 10)
An invalid parameter was passed to a service or function.
Code 10 means that Windows is saying "There's a problem, but I don't know what." And well, I'm stumped by this.
The drivers work perfectly fine if I'm booted normally, which is why I'm confused. In the meantime, I'll continue my rampage across the internet for a solution to this problem that actually WORKS.
If you're wondering, I using Windows 10.

TheEthanMaverick said:
First of all, I would like to point out that the XDA Developers website has made this problem harder than it needed to be. This post is originally from Stack Exchange, but people said I would have more luck here with this problem. But every little thing I do it a problem. Try to use a proxy on the website? Nope. Try to post this in the Samsung Galaxy S7 section, where it's SUPPOSED to be? Nope. I know it's all to prevent spam, but I mean come on. Be a little lenient here. Anyways, I'm done with my rant. Back to the post.
I have made the mistake of trying to root my phone. Which is fine, but it's a lot more complicated than I thought it was, but since I have asperger's, once I start something, I feel like I have to finish it.
I have a Samsung Galaxy S7 (SM-G930U) with Sprint. I've heard that these phones are EXTREMELY difficult to root. Some even call it impossible. But I can at least try.
I ended up getting tunneled down a endless loop of tasks to complete before I actually root my phone, for preparation. One of the things I must complete is I have to install a TWRP Recovery Image in case of failure. But in order to do that, I have to unblock the bootloader.
To do this, I am using Platform Tools, with includes ADB (Android Debugging Bridge), and Fastboot. I connect my phone to my PC via USB cable, open the CMD, and type:
adb reboot bootloader
Once I do this, my phone reboots into the bootloader, just like it should. Normally, the next step I would take would be to type in:
fastboot oem unlock
When I do this, I am left with the message:
< waiting for any device >
I'm assuming that means that it's not detecting my phone at all. It's odd though, because it was able to detect my device perfectly fine whenever my phone was booted normally, but when I go into the bootloader, it doesn't detect my phone anymore.
After hours of searching around the internet, I found that a potential problem could be the drivers of my phone that are installed on my PC.
Sure enough, if I open up the Device Manager, when in the bootloader, under Universal Serial Bus Controllers, I found the driver "SAMSUNG Mobile USB CDC Composite Device", with a little yellow arrow next to it on the icon.
If I double-click on the entry, in the "Device Status" box, it will say:
This device cannot start. (Code 10)
An invalid parameter was passed to a service or function.
Code 10 means that Windows is saying "There's a problem, but I don't know what." And well, I'm stumped by this.
The drivers work perfectly fine if I'm booted normally, which is why I'm confused. In the meantime, I'll continue my rampage across the internet for a solution to this problem that actually WORKS.
If you're wondering, I using Windows 10.
Click to expand...
Click to collapse
I am having similar problems with my Galaxy S7. In order to make any significant changes, the bootloader MUST be unlocked FIRST. Hence, the dilemma, if you can't make changes without an unlocked bootloader, and you can't unlock the bootloader, what can be done.

As far as I know Samsung devices simply don't have no fastboot support. Refer to Odin flashing tool instead.

Bootloader not unlocking

Hello there, probably this is one of the stupid questions that you will read so I am sorry.
I got this phone in state of BLOD, checked and found out that I need the device unlocked so I decided freezing will do that job after reading the infamous guide on this page. Took it out and woila, it turns on now. I happily go to settings, enable developer options, and enable OEM unlock and USB debugging, happily restarted my phone and it's still locked. after dancing around for some time trying to find a way to unlock it, I decided to flash official os (android 8) through recovery mode ADB. Now I can't even boot by putting it into a freezer and when I try to flash an other version like android 6, it says that it's meant for "Angler" and my device is "", yeah "" it's empty.
Do I put this device in a wall I am building?

KamiNazy said:
Hello there, probably this is one of the stupid questions that you will read so I am sorry.
I got this phone in state of BLOD, checked and found out that I need the device unlocked so I decided freezing will do that job after reading the infamous guide on this page. Took it out and woila, it turns on now. I happily go to settings, enable developer options, and enable OEM unlock and USB debugging, happily restarted my phone and it's still locked. after dancing around for some time trying to find a way to unlock it, I decided to flash official os (android 8) through recovery mode ADB. Now I can't even boot by putting it into a freezer and when I try to flash an other version like android 6, it says that it's meant for "Angler" and my device is "", yeah "" it's empty.
Do I put this device in a wall I am building?
Click to expand...
Click to collapse
Not an expert but what you had to do was oem unlock and then usb debugging, after that connect the device and give ADB the permission so it installs adb interface driver. After that, reboot to bootloader open adb and try to unlock. It wouldn't be possible so, you manually install the google driver so it installs the bootloader interface, after that do the fastboot unlocking