A5 (2016) Stuck on Boot-screen (Samsung Logo) after Software Upgrade - Galaxy A3, A5, A7, A8, A9 Q&A, Help & Troubleshoot

Hi guys I kindly require your assistance concerning my Samsung A5 2016 A510F, device was running android 5.1.1 before I updated to android 7.0. Here's the reason why I updated, device was acting shaggy it would suddenly close apps during operation. for an example with error "messaging has stopped working" would close most of the apps with the same error or suddenly restarts itself especially when the battery is less than 50%.
So I then attempted to do OTA update but failed to install "error, invalid file" so I went the Odin way, Downloaded stock firmware and flashed via Odin, everything went smooth until reached the "apps optimization 40 of 40" stacked there for about 30 minutes until i decided to restart the device, upon restart the device no longer went pass the Samsung logo stacked there.
Here's what I tried to resolve the issue:
- Cleared cache
- Factory reset
On recovery screen i noticed an error about "e: failed to mount partition" I tried almost every solution I came across to on Google with no luck. I then tried flashing to this custom rom https://forum.xda-developers.com/samsung-a-series/development/rom-resurrection-remix-rr-v6-unofficial-t3765542
Installed successfully but gets stuck on "checking for software update" I reinstalled the custom ROM again but this time without the GAPPS device booted successfully to home screen, went back to TRWP this time installed the GAPPS rebooted, it went successful, however device is unusable it keeps popping error "google play services closed" every 2 seconds.
Please help, is my phone officially dead I need clarity. Your assistance will be highly appreciated thanks in advance

b0ng0s said:
Hi guys I kindly require your assistance concerning my Samsung A5 2016 A510F, device was running android 5.1.1 before I updated to android 7.0. Here's the reason why I updated, device was acting shaggy it would suddenly close apps during operation. for an example with error "messaging has stopped working" would close most of the apps with the same error or suddenly restarts itself especially when the battery is less than 50%.
So I then attempted to do OTA update but failed to install "error, invalid file" so I went the Odin way, Downloaded stock firmware and flashed via Odin, everything went smooth until reached the "apps optimization 40 of 40" stacked there for about 30 minutes until i decided to restart the device, upon restart the device no longer went pass the Samsung logo stacked there.
Here's what I tried to resolve the issue:
- Cleared cache
- Factory reset
On recovery screen i noticed an error about "e: failed to mount partition" I tried almost every solution I came across to on Google with no luck. I then tried flashing to this custom rom https://forum.xda-developers.com/samsung-a-series/development/rom-resurrection-remix-rr-v6-unofficial-t3765542
Installed successfully but gets stuck on "checking for software update" I reinstalled the custom ROM again but this time without the GAPPS device booted successfully to home screen, went back to TRWP this time installed the GAPPS rebooted, it went successful, however device is unusable it keeps popping error "google play services closed" every 2 seconds.
Please help, is my phone officially dead I need clarity. Your assistance will be highly appreciated thanks in advance
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Hi there, I am wondering if you resolved your issue because I have exactly the same problem. Any infos would help me a lot.
Thank you

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[Q] (Q) gs4 hangs on samsung logo with launchers

Hello guys, this is my first post and question so please I hope mistakes will be forgiven
So I am using jb 4.2.2 rooted s4 and whenever I install a 3rd party launcher and restart the cell it hangs on samsung logo and get stuck there forever. I have to literally pull back the battery and put it 9 10 times to8 let it boot past logo successfully. First launchers used to work fine. I dont know if any app is causing it. Tried wiping cache and dalvik cache. Still problem persist.
Also I cant update my android from setting update menu. It first says registering device and then shows error "processing failed". Used to happen before root too

Error: unfortunately the process com.android.systemui has stopped (4.4.2)

Hi to everyone and thank you in advance for your time and expertise.
When I press the "HOME" button at the centre I get this error: unfortunately the process com.android.systemui has stopped (clock is off by 12 hours, too). The error does not appear in other circumstances.
Following advice on XDA I rebooted in recovery and I did a cache wipe/format.
The phone got stuck (2 hours) on formatting cache.
I removed the battery and restarted but when I press the "HOME" button the error "unfortunately the process com.android.systemui has stopped" was still present.
I rebooted in recovery, again, but found that I had a new error: "cannot mount(open) /cache/recovery"
I followed yet another thread on XDA ("cannot mount(open) /cache/recovery"), rebooted in recovery, again, but this time I wiped the dalvik cache.
I rebooted but when I pressed the "HOME" button, again, the error "unfortunately the process com.android.systemui has stopped" was still present.
I rebooted in recovery again (this time there was no error "cannot mount(open) /cache/recovery") and I wiped/formatted the cache.
This time the phone did not get stuck and formatting of cache completed succesfully.
When I rebooted I got the message "Android is upgrading" and a list of 270 apps were "upgrading".
When the phone restarted and I pressed the "HOME" button, the error "unfortunately the process com.android.systemui has stopped" was still present.
Please note that if I do not press the centre "HOME" button, the error does not appear.
Can anyone please help me resolve the Error: unfortunately the process com.android.systemui has stopped"? I do not want to format to factory setting. The phone was rooted by a friend 3 years ago and he now left the country and I am completely ignorant about android in general and rooting etc... so I am afraid to format to factory settings and, please, use simple step by step instructions with easy language...
Again, thank you in advance for your time/expertise.
Samsung Note 3 SM-N9005
4.4.2 rooted
---------------------------------------------------------------
Edit 1
After posting this help request, I continued to search and I found this: http://android.stackexchange.com/que...s-stopped-on-g. I uninstalled Google App updates, I rebooted the phone, pressed the centre "HOME" button and the error did not come up. I then rebooted the phone again, and this time the phone started to update Google Services and Google automatically. I then pressed the centre "HOME" button, again, to check and, again, everything worked fine. I decided to try to actually used google (search), and this time the error came back, once more.
So it seems that the problem is connected to using Google after the upadetes. Any ideas how to fix the error?
---------------------------------------------------------------
Edit 2
Temporarily, I disabled < Google Apps > update and this fixed the problem but, of course this is not a permanent solution and I need to fix Android 4.4.2 so that it will not give me that error if I update < Google Apps >.

Constantly Rebooting

Hello, one week ago I received the Axon 7 mini from Gearbest, since then I haven't used it that much, but yesterday while watching a youtube video it turned off suddenly and when I tried to turn it on it just gotted stuck in the zte logo. After several tries, and trying of wiping the data and doing the factory reset (what gave error messages such as "can't mount"...), I decided to update it to from the sd card using firmware of the russian zte. After that the phone could pass the zte logo and start the configuration screen slowly, but started to rebooting, it took me several trys till I could finish the set up, but the problem was still, then I tried to do the factory reset as well as data wipe now succesfully, but the rebooting and slowness still there, so I can't do anything because I can't finish the setup correctly, and even the only way to turn off the phone without the boot loop is inside the menu of android recovery. I hope you can help me, thanks.

'System UI isn't responding' and 'Process system isn't responding' w/ restarts

(Moved from general discussion)
Hey all,
I've run into a bit of a pickle..
I replaced the screen on my S8 (SM-G950U) and after booting, it immediately gives 'System UI isn't responding' and/or 'Process system isn't responding'.
Shortly after (1-3 minutes) the phone will reboot. The errors may appear 1-2 more times before rebooting.
A bit of info:
Model: SM-G950U
OS: G950USQU4CRE9
Steps taken:
Clearing cache does nothing.
Factory reset via recovery mode has no change.
Flashing stock ROM (same version) with ODIN does nothing either.
Before restoring I was able to go in and see the RAM was reporting what I assume is normal (~30% usage)
Also the front camera was no longer working, but I've replaced that as well and haven't had the phone on for long enough to get through the initial setup to test.
Anyone have a potential solution / suggestion? Any and all help is appreciated. Thanks!
Edit:
It might also be worth noting that the shutdowns only happen after booting. There's no issue when entering recovery / download mode.
Havr you tried safe mode?
I know this is an old thread but hoping to get some guidance. I am facing the exact same issue on my at&t s8+ snapdragon as mentioned above. The device is unrooted and was with stock oreo rom. suddenly started showing either "system iu isn't responding" or "process system isn't responding". Later the device started hanging and kept restarting. It restarts from samsung logo instead of the device model name unless force restarted. This cycle keeps happening. I am able to access download mode and recovery without any problem. recovery initially shows "installing update" followed by "no command" but then works normally. The device doesn't power off even from recovery, it keeps rebooting. I have tried (1) cache wipe (2) factory reset from recovery (3) safe mode (4) installed stock rom without problem (5) installed latest stock s8+ unlocked xas pie rom without problem (6) installed latest stock s8+ sprint version pie rom without problem but i am unable to even end the initial device setup as the device keeps hanging with these errors and restarts. Any ideas would be appreciated.

G950F (Austria) - not able to boot up: 'Installing system update' leads to error

Hi all, maybe there is someone active here who can help me bringing my SM-G950F back to life without losing my app / user data.
Last thing I did was installing an App called 'Airwatch Intelligent Hub' in the Google Play Store. This for some reason caused a reboot and this is where trouble started.
Here's what happens:
My phone is shut down - I'm turning it on.
'Installing system update' message shows up
'No command' error message shows up
After some time, an additional error message in the stock recovery shows up -
I am selecting 'Reboot System now' - I have Secure boot enabled, entering PIN
Loading animation shows up
The phone reboots during loading animation
I have to enter the PIN for secure boot the 2nd time
Loading animation shows up
Phone seems to start - 'optimizing app m of n'
Loading animation shows up for some time
Back to the 'installing system update' screen
Error message in Android recovery
After shutting down the phone, I am able to repeat the whole process
Photo story of the boot process:
Here's what I have tried:
Cleared cache out of the recovery
Did a full power circle
Tried safe boot, but without any success
...
Downloaded the stock ROM (Andriod 9) for Austria (A1)
Flashed the stock ROM via Odin 3, but with the CSC_home to avoid a loss of user data
The process finishes successfully, but after starting the phone, the process described above starts...
Hey. First of all they app you tried is the reason of this (maybe) so you need to wipe it . Don't worry it be fine but you have to loose your data in order to use it . Open recovery somehow and then wipe data then try restart may it work if not then flash stock rom its not compulsory to flash Austria ROM i mean you can flash other versions just the file should be for sm g950f. I hope may it helps you just give it a try. Data is not going to be usable unless your phone is.
StayBlessed.?

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