Pixel 4a stuck in fastboot loop after trying to flash kernel - Google Pixel 4a Questions & Answers

I was trying to follow this guide: https://github.com/felikcat/unlimited-hotspot
I used this kernel: https://forum.xda-developers.com/t/...ribute-for-google-pixel-4a-a11-a12-l.4258269/
My device is now stuck in a loop where it will boot to fastboot, but no matter which option I select (aside from barcode and power off) brings me back to the fastboot. I'm unable to boot into recovery mode.
My computer is unable to find my device with adb and fastboot.
Any help would be greatly appreciated
I realized I did not have the USB drivers installed for my device. After installing, fastboot on my computer is able to detect my device, but I am unsure about how to proceed from here
Okay so I followed this guide: https://forum.xda-developers.com/t/guide-unlocking-downgrading-to-a10-twrp-root.4233275/
and was able to complete is successfully. My phone is now rooted on android 10. I have a couple questions
My phone was rooted and on android 11 prior to this incident, but it was so long ago that I don't remember how I did it. Is it possible to get back to android 11?
My second question is that I'm wondering if it's still possible to follow that previous guide, preferably without breaking my phone this time

Related

Install ADB and FastBoot on (soft) bricked phone.

Hello, I have been trying to install a new ROM to my zte axon mini b216 phone, but I messed up somewhere, and now, I can only boot into recovery mode, to be able to install TWRP, I read that I need to, install ADB, fastboot for my device, however, the tutorials unlock debugging option for the phone using Android (that I can't boot into).
Please help :highfive: (I have miFavor(recovery))

I somehow broke TWRP

I haven't really touched this tablet in a while, but i wanted to start using it again. I was running BlissPop. It was slow, and kept giving me an error when it was trying to update, so I decided to try a different ROM. So I downloaded the lineageOS ROM and tried to flash it.
However, TWRP kept giving me an error when I tried to flash the ROM. I don't remember exactly what the error was.
So, I thought that I needed to update TWRP. I tried through the "Official TWRP" app, but after doing so I was unable to boot into recovery mode at all. I could still get to the bootloader, but when I tried to select recovery mode it would give me an error and dump me back out to the bootloader menu.
I tried installing twrp through "TWRP Manager" app, but it just says "something went wrong"
I tried doing this using ADB. I connected the tablet, enabled USB debugging. If i do the ">adb devices" command, I can see the tablet. Then I did >adb reboot bootloader - which works, it reboots the device into the bootloader. But then I try and flash recovery and nothing happens, it just says <waiting for device>. And if I do > fastboot devices it doesn't list any devices.
If I reboot to the bootloader and select "Recovery Mode' i just get the nvidia boot logo and it stays there forever.
I don't know what else to try at this point.
I think I could get this to work if I could just get fastboot to recognize my device, but I'm not sure what's preventing that from happening.
mattlokk said:
I haven't really touched this tablet in a while, but i wanted to start using it again. I was running BlissPop. It was slow, and kept giving me an error when it was trying to update, so I decided to try a different ROM. So I downloaded the lineageOS ROM and tried to flash it.
However, TWRP kept giving me an error when I tried to flash the ROM. I don't remember exactly what the error was.
So, I thought that I needed to update TWRP. I tried through the "Official TWRP" app, but after doing so I was unable to boot into recovery mode at all. I could still get to the bootloader, but when I tried to select recovery mode it would give me an error and dump me back out to the bootloader menu.
I tried installing twrp through "TWRP Manager" app, but it just says "something went wrong"
I tried doing this using ADB. I connected the tablet, enabled USB debugging. If i do the ">adb devices" command, I can see the tablet. Then I did >adb reboot bootloader - which works, it reboots the device into the bootloader. But then I try and flash recovery and nothing happens, it just says <waiting for device>. And if I do > fastboot devices it doesn't list any devices.
If I reboot to the bootloader and select "Recovery Mode' i just get the nvidia boot logo and it stays there forever.
I don't know what else to try at this point.
I think I could get this to work if I could just get fastboot to recognize my device, but I'm not sure what's preventing that from happening.
Click to expand...
Click to collapse
Did you set:
Allow oem unlock in dev opt.
Fastboot protocol into BL?
Twrp app & manager need root to work.
Just flash the latest stock ROM first, lineageos requires having latest firmware.
I wrote a little guide not long ago about that (obviously, you can skip the F2FS steps if you don't need F2FS and just flash ROM after flashing latest TWRP)
Link
thanks for the help, i'll try and work through this soon.
fpozar said:
Just flash the latest stock ROM first, lineageos requires having latest firmware.
I wrote a little guide not long ago about that (obviously, you can skip the F2FS steps if you don't need F2FS and just flash ROM after flashing latest TWRP)
Link
Click to expand...
Click to collapse
I had seen your thread, and was intending on following it. nice post. 2 quick questions though
1) this is a shield tablet that was supposed to be remotely bricked by nvidia after the warranty claim. Will that happen if I flash the official recovery ROM?
2) how would I even flash that rom if I can't get recovery mode to work in trwp?
I think the root problem that I'm having is that I can't seem to connect to the device via fastboot (i'm sure i used the wrong terminology somehow)
edit: well I downloaded the USB driver for the shield tablet from nvidia, and i was able to install that (rather than the google usb driver). Fastboot finally recognized my device after that. I'm trying to flash the recovery now, but it doesn't seem to be doing anything, just been stuck on this screen for a while now: https://i.imgur.com/BUwj3Hx.png guess I'll continue to wait a while.
edit 2: well, finally got TWRP to flash over fastboot (https://i.imgur.com/tV1DqDv.png) however I still can't enter recovery mode. I just get the nvidia boot logo and then nothing happens. TWRP manager still says i don't have it installed either.
i'm about ready to give up on this... i've spent like 6 hours on this crap already and I feel like I keep getting further away from it.
mattlokk said:
I had seen your thread, and was intending on following it. nice post. 2 quick questions though
1) this is a shield tablet that was supposed to be remotely bricked by nvidia after the warranty claim. Will that happen if I flash the official recovery ROM?
2) how would I even flash that rom if I can't get recovery mode to work in trwp?
I think the root problem that I'm having is that I can't seem to connect to the device via fastboot (i'm sure i used the wrong terminology somehow)
edit: well I downloaded the USB driver for the shield tablet from nvidia, and i was able to install that (rather than the google usb driver). Fastboot finally recognized my device after that. I'm trying to flash the recovery now, but it doesn't seem to be doing anything, just been stuck on this screen for a while now: https://i.imgur.com/BUwj3Hx.png guess I'll continue to wait a while.
edit 2: well, finally got TWRP to flash over fastboot (https://i.imgur.com/tV1DqDv.png) however I still can't enter recovery mode. I just get the nvidia boot logo and then nothing happens. TWRP manager still says i don't have it installed either.
i'm about ready to give up on this... i've spent like 6 hours on this crap already and I feel like I keep getting further away from it.
Click to expand...
Click to collapse
Okay so I'm guessing you have stock ROM.
To flash TWRP you have to enter fastboot mode (vol down + power I believe) and flash the twrp image with fastboot flash recovery twrp.img (rename the shield tablet twrp to just twrp.img and place it into your easy adb and fastboot folder)
And DON'T reboot into OS, rather use your volume buttons to navigate to "restart to recovery" or just use hardware keys again directly from TWRP (vol up + power).
Good luck
fpozar said:
And DON'T reboot into OS, rather use your volume buttons to navigate to "restart to recovery" or just use hardware keys again directly from TWRP (vol up + power).
Good luck
Click to expand...
Click to collapse
Agreed. This is probably what is happening (as described on the TWRP webpage here:
Note many devices will replace your custom recovery automatically during first boot. To prevent this, use Google to find the proper key combo to enter recovery. After typing fastboot reboot, hold the key combo and boot to TWRP. Once TWRP is booted, TWRP will patch the stock ROM to prevent the stock ROM from replacing TWRP. If you don't follow this step, you will have to repeat the install.
Alternately, immediately rooting (flash SuperSU or Magisk) right after flashing TWRP, will prevent TWRP from being replaced with stock recovery.
Although the inconsistent fastboot connection, and how much trouble you had flashing TWRP initially, is a bit worrisome. Try using a different cable (maybe the one you are using is not connecting well?) try another USB port on the computer, and don't use a USB hub (connect direct to the PC).
Well, like they say: persistence is key. I kept pushing and trying new things until eventually.... I bricked the device. No, not really, it's working great now on LineageOS.
Thanks again to everyone who helped me out :good:. I'm still not sure exactly what caused TWRP to stop working on my device, however following this guide helped me fix it: https://forum.xda-developers.com/shield-tablet/help/help-stuck-nvidia-boot-screen-t3076462
The "flash-all.bat" restored everything to stock (including the recovery mode) and after that I was able to flash the latest TWRP and install Lineage.

One plus 6 completly bricked

Hi everyone,
I'm quite new to unlocking and rooted phone, but I've read many many post on this forum but nothing worked....
Here what's happening;
Few days ago I wanted to Recover from TWRP a backup that I've made. I launch the recovery from TWRP (important details, it was a backup that I made from slot B in twrp....) in slot A.
So yes I indeed restore a slot B recovery into the slot A in TWRP.....
And I tried to reboot after that..... and the problems begins !!
I just have a blackscreen with a blue light, nothing happened..... Same thing If i try to boot into recovery mode.....
Since I tried many many things but nothing worked...... I can't boot into TWRP from fastboot.
When I'm trying that:
Code:
fastboot boot twrp-3.2.2-0-enchilada.img
The phone just reboot and got stucked on the screen with one plus logo and the text "fastboot mode" below the logo.....
I read all these post below and everything I tried (erase all data, change the active slot on fastboot mode......)didn't work:
https://forum.xda-developers.com/oneplus-6/help/oneplus-6-os-twrp-stuck-fastboot-screen-t3870989
https://forum.xda-developers.com/oneplus-6/help/stuck-fastboot-rooted-help-please-t3851802
This one I didn't really understand exactly what needed to be done but I guess I need to boot into a custom recovery as well:
https://forum.xda-developers.com/oneplus-6/how-to/guide-mega-unbrick-guide-hard-bricked-t3796051
Even tried that but it didn't unbrick the phone:
https://forum.xda-developers.com/oneplus-6/how-to/rom-stock-fastboot-roms-oneplus-6-t3796665
I tried to boot into another recovery, but same thing not working/booting;
Code:
fastboot boot blu_spark_r65-oos-pie_op6_9a5f932e4.zip
So I'm desesperate and really really need help !!:crying::crying:
Does anyone can help me step by step or has a solution please?
I can access to fastboot mode that is the only think I can do and the bootloader is unlocked.
Go and see there :
https://forum.xda-developers.com/oneplus-6/how-to/tool-msmdownloadtool-v4-0-international-t3903272
You'll get your phone like it comes out of the box.
yep, do this:
https://forum.xda-developers.com/oneplus-6/how-to/tool-msmdownloadtool-v4-0-international-t3903272
I had the same problem with my OP3. i cant get past the fastboot screen. after i tried the tool everything was back to normal. but i had to oem lock after it to boot up.
Also use the official twrp for a fully functional backup and restore
Thank you all for your reply !
I've tried to follow the process from the link but the MSMTool is not finding my OP6 and I've uninstall in the Device Manager as indicated:
HTML:
plug in the phone to the computer, go in device manager and under port (COM) disinstall qualcomm one (oneplus 6) and then unplug
But When I go into safe mode and re-plug, I can't do this part because I don't have this information....
HTML:
Now you have to see US8_BULK as new device connected and you can also see in device manager; if you can't notice it, repeat the process until you see it (power on, power off, hold...) there is a full youtube guide for op5 and it's the same process
I tried on 2 different PC (Windows 10 and 7) but nothing worked so I can't used the MSMTool
You have to use it in safe mode to install the unsigned drivers. It only works when you see the device as something like 9800 in your device manager.
Dont worry if it fails a few times. I had to do this 8 times on my OP3 till it was successful.
You can also use this guide:
https://forum.xda-developers.com/oneplus-3/how-to/guide-mega-unbrick-guide-hard-bricked-t3405700
The steps are the same

Just bricked

Okay so yesterday I decided to finally try to install TWRP to flash a custom rom on the system, but never thought it would give so much headache. My drivers were bad, the system locked and android 11 updating making the phone all sorts of bugs, I was anxious to get rid of it, and I did somehow. I was unable to flash TWRP into the recovery as the system partition type is different than usual for it seems, but the recovery partition was all weird, "no command" was stuck in the screen even after a hard reset through there. So I got Magisk and got Root and used Smart Flash to install TWRP through the running system and it landed successful. But when going to the recovery the TWRP screen was flickering, but I could send ADB commands yet and boot normally, I just couldn't access the recovery functions yet. So I flashed a different version of the TWRP with the IMG and the zip folder and nothing worked then I realized that maybe I should erase the partition before flashing it and then the murder. I found a tutorial on erasing stuff, but the whole process cost me more than twelve hours as I messed with so many things and was kinda learning the hows and dos.
But then I saw the command "fastboot erase system -w" that was a shortcut for all cleanup processes and I was wanting to wipe it again even to recover my google backup and be able to use my messenger apps. But it did erase, of course, the whole system and everything, simply destroying everything, but yet stuck in the fastboot screen. What I did? Well, I downloaded the TGRZ of an older version of xiaomi mi a3 firmware, the android 10, as I was tired and thought that maybe if I downgraded it I would get my phone to get rid of android 11 bugs and sleep for good till tomorrow, that is today. I ran the script to wipe anything and install the system over it and it did successfully, then the message "successfully installed, press any key to finish" but then the prompt closed and the phone tried to reboot but fell into a hard brick. The computer recognizes the device as the name "QUSB_BULK_CID:0411_SN:EFCF04FD" and the hardware ID "USB\VID_05C6&PID_9008" matches the original.
So is there anything I could do yet? Phone warranty ended in january and that's why I tried that process, it is any worth?
BillyWroth said:
Okay so yesterday I decided to finally try to install TWRP to flash a custom rom on the system, but never thought it would give so much headache. My drivers were bad, the system locked and android 11 updating making the phone all sorts of bugs, I was anxious to get rid of it, and I did somehow. I was unable to flash TWRP into the recovery as the system partition type is different than usual for it seems, but the recovery partition was all weird, "no command" was stuck in the screen even after a hard reset through there. So I got Magisk and got Root and used Smart Flash to install TWRP through the running system and it landed successful. But when going to the recovery the TWRP screen was flickering, but I could send ADB commands yet and boot normally, I just couldn't access the recovery functions yet. So I flashed a different version of the TWRP with the IMG and the zip folder and nothing worked then I realized that maybe I should erase the partition before flashing it and then the murder. I found a tutorial on erasing stuff, but the whole process cost me more than twelve hours as I messed with so many things and was kinda learning the hows and dos.
But then I saw the command "fastboot erase system -w" that was a shortcut for all cleanup processes and I was wanting to wipe it again even to recover my google backup and be able to use my messenger apps. But it did erase, of course, the whole system and everything, simply destroying everything, but yet stuck in the fastboot screen. What I did? Well, I downloaded the TGRZ of an older version of xiaomi mi a3 firmware, the android 10, as I was tired and thought that maybe if I downgraded it I would get my phone to get rid of android 11 bugs and sleep for good till tomorrow, that is today. I ran the script to wipe anything and install the system over it and it did successfully, then the message "successfully installed, press any key to finish" but then the prompt closed and the phone tried to reboot but fell into a hard brick. The computer recognizes the device as the name "QUSB_BULK_CID:0411_SN:EFCF04FD" and the hardware ID "USB\VID_05C6&PID_9008" matches the original.
So is there anything I could do yet? Phone warranty ended in january and that's why I tried that process, it is any worth?
Click to expand...
Click to collapse
You should never try to install software for another board (mi mix 3 global is codenamed "perseus")...
If you are unable to reach fastboot and recovery, you may refer to this, since it sounds like your phone is in EDL mode:
Reboot to EDL mode from FASTBOOT!
Reboot to EDL mode from FASTBOOT! No more Test Point Method needed Technical Details: Redmi Note 3 support rebooting to EDL in Android Bootloader aboot module (the "reboot-edl" command) but fastboot utility doesn't recognize "reboot-edl" in the...
forum.xda-developers.com
I never encountered this issue so only do this if you're absolutely sure you have no other means of flashing anything on it (i.e. through fastboot), and use the appropriate firmware at all times for your specific model
CriGiu said:
You should never try to install software for another board (mi mix 3 global is codenamed "perseus")...
If you are unable to reach fastboot and recovery, you may refer to this, since it sounds like your phone is in EDL mode:
Reboot to EDL mode from FASTBOOT!
Reboot to EDL mode from FASTBOOT! No more Test Point Method needed Technical Details: Redmi Note 3 support rebooting to EDL in Android Bootloader aboot module (the "reboot-edl" command) but fastboot utility doesn't recognize "reboot-edl" in the...
forum.xda-developers.com
I never encountered this issue so only do this if you're absolutely sure you have no other means of flashing anything on it (i.e. through fastboot), and use the appropriate firmware at all times for your specific model
Click to expand...
Click to collapse
well it seems I recovered it back, I bricked it and somehow it just got into EDL mode without cable or opening it up. So I found a tutorial back on reddit showing how use GFIL to install the stock rom back. I used android 10 stock rom before bricking it, but as I just flashed everything on empty partitions it didn't work, it seems that the Qualcomm setup needs some kind of previous work to set everything up. Anyways I managed to boot it, but now I'm aware that I should use Lineage recovery instead of TWRP as Mi A3 support is lacking, that's why after installing it I got it flickering (no compatible version with the latest Android 11 firmware).
BillyWroth said:
well it seems I recovered it back, I bricked it and somehow it just got into EDL mode without cable or opening it up. So I found a tutorial back on reddit showing how use GFIL to install the stock rom back. I used android 10 stock rom before bricking it, but as I just flashed everything on empty partitions it didn't work, it seems that the Qualcomm setup needs some kind of previous work to set everything up. Anyways I managed to boot it, but now I'm aware that I should use Lineage recovery instead of TWRP as Mi A3 support is lacking, that's why after installing it I got it flickering (no compatible version with the latest Android 11 firmware).
Click to expand...
Click to collapse
hello, im having maybe a similiar case with my phone (in this case its a MI A3) i installed "succefully" evolution x 6.3 on my phone and everthing was ok with a few bugs, the only problem was that mi cannot connect to internet, so i decided to restart the phone and now my phone just don't turn on, the power button don't respond and i cannot start up my phone and its just a black screen, if u remeber ¿can u pass the tutorial that u saw on reddit? maybe it can help me

Pixel 4a stuck in fastboot mode

Tried to follow this guide to root my pixel 4a and completed all steps up to 3.4. My phone is now stuck in fastboot mode and I can't get into recovery mode to do a factory reset. Not sure what to do, I'm a little lost. I accidentally used this or this image for Android 10 when I think I should have used this image for Android 11.
Any help would be very appreciated.
Maybe you can use this guide:
[GUIDE] UNLOCKING, DOWNGRADING TO A10, TWRP, ROOT
Hello, I'm posting this guide for those (like me) who can't do without TWRP on their device. I'm providing only a step-by-step explanation. Credits to @nikamura for his kernel and TWRP...
forum.xda-developers.com
And start on this line in "First Step" section:
Plug the phone into a usb port of your pc.
Then complete all the tasks in "Second Step" section to get your phone at least booting in android 10.
ifixibrick said:
Tried to follow this guide to root my pixel 4a and completed all steps up to 3.4. My phone is now stuck in fastboot mode and I can't get into recovery mode to do a factory reset. Not sure what to do, I'm a little lost. I accidentally used this or this image for Android 10 when I think I should have used this image for Android 11.
Any help would be very appreciated.
Click to expand...
Click to collapse
Run the online flash tool from bootloader screen bro. Make sure you install adb and fastboot tools.
Raj Pandiyan said:
Run the online flash tool from bootloader screen bro. Make sure you install adb and fastboot tools.
Click to expand...
Click to collapse
How do I do that? I seem to be stuck in fastboot mode.
ifixibrick said:
How do I do that? I seem to be stuck in fastboot mode.
Click to expand...
Click to collapse
Is it bricked? Cannot flash stock Android to remove ArcaneOS
I recently purchased a used Pixel 4a, and I now understand why the seller was offering such good price for it and why he refused to respond to me now I have it. This phone has ArcanseOS 10 installed, which has only 3 apps installed... Setting...
forum.xda-developers.com
reboot to recovery, press volume up + power to bring up the recovery settings, turn on sideloading
then adb sideload the factory image.
jawz101 said:
reboot to recovery, press volume up + power to bring up the recovery settings, turn on sideloading
then adb sideload the factory image.
Click to expand...
Click to collapse
Hello. Currently stuck in fastboot mode. Using the volume buttons to select recovery mode and pressing the power button to go into it doesn't take me to recovery mode. The screen briefly goes dark before entering fastboot again. I think the phone is trying to restart but not getting past fastboot mode.
ifixibrick said:
Hello. Currently stuck in fastboot mode. Using the volume buttons to select recovery mode and pressing the power button to go into it doesn't take me to recovery mode. The screen briefly goes dark before entering fastboot again. I think the phone is trying to restart but not getting past fastboot mode.
Click to expand...
Click to collapse
Can you type fastboot reboot recovery and get into recovery mode? You'll see a little Android guy with a red thing if you're in there.
If that doesn't work- it almost sounds as though your recovery partition is deleted or something. You can reflash the recovery from fastboot.
Hey, I had the same problem. I've got it resolved now and wasn't able to find any help on how to resolve it, but this thread is as close as it came, so in the off chance that somebody else comes along, I thought I'd write up the steps I took.
Because it was in fastboot mode, I was able to easily restore my phone to factory settings by running flash factory image script I downloaded here.
My original image was sunfish-rq3a.210605.005-factory-be541467 which I followed the steps with but couldn't get it to work. I got to the Google logo with a status bar that just ran forever. But the flash-all.sh script worked to get the phone booting again.
So what I did to get Magisk to work was to use that same factory image site to download an older version. I used a version that was listed in a different root guide with the idea that maybe the version I tried before wasn't compatible with magisk, but presumably the one from the guide was. So I tried sunfish-rq1a.210105.002, ran the flash-all in fastboot, and confirmed that it booted--it did.
Next I redid 2.2 through 3 and it worked, and the boot completed with Magisk installed. Everything seems to be working fine now.

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