MOJO Won't Boot Past Mad Catz Logo - M.O.J.O. General

After some help
The other night my MOJO just reboot itself when I clicked on an App ( KODI ) and since then won't boot past the Mad Catz logo. I hadn't had it long and it wasn't rooted or modified in anyway. I'm looking for some way to do a hard reset either by attaching a keyboard or connecting it to a PC. Any advice is appreciated.

Install the fastboot drivers and the TWRP image on a PC, see the development section and the TWRP thread. Connect the booted PC to the MOJO with a USB male2male cord then power on the MOJO. Following the directions in the thread boot the MOJO to the TWRP image and do a factory wipe. If that doesn't do it then reinstall the firmware or a custom ROM.

kevinthefixer said:
Install the fastboot drivers and the TWRP image on a PC, see the development section and the TWRP thread. Connect the booted PC to the MOJO with a USB male2male cord then power on the MOJO. Following the directions in the thread boot the MOJO to the TWRP image and do a factory wipe. If that doesn't do it then reinstall the firmware or a custom ROM.
Click to expand...
Click to collapse
I've think I've managed to wipe the OS off my Mojo - I get back into fastboot but it says drivers not found, any idea how I can get back into TWRP as I know it is on the system

Msr Blobby said:
I've think I've managed to wipe the OS off my Mojo - I get back into fastboot but it says drivers not found, any idea how I can get back into TWRP as I know it is on the system
Click to expand...
Click to collapse
So far you're good. "Key driver not found" is normal, don't worry about it. Copy the TWRP .img to the same folder ON YOUR PC as the fastboot command. Now it depends on which fastboot you are using but you need to enter a command on the PC like:
fastboot-windows.exe -i 0x0738 boot openrecovery-twrp-2.8.2.0-mojo.img
See the recovery thread:
http://forum.xda-developers.com/mad...overy-twrp-2-8-2-0-recovery-mad-catz-t2973640
So you're actually booting to an image on the PC, not on the MOJO.

kevinthefixer said:
So far you're good. "Key driver not found" is normal, don't worry about it. Copy the TWRP .img to the same folder ON YOUR PC as the fastboot command. Now it depends on which fastboot you are using but you need to enter a command on the PC like:
fastboot-windows.exe -i 0x0738 boot openrecovery-twrp-2.8.2.0-mojo.img
See the recovery thread:
http://forum.xda-developers.com/mad...overy-twrp-2-8-2-0-recovery-mad-catz-t2973640
So you're actually booting to an image on the PC, not on the MOJO.
Click to expand...
Click to collapse
Thanks - it worked! I managed to reboot into TWRP and then ADB sideload the CM12 build onto my SDCard (it wouldn't let me access the ext sd where all the files were stored). Then recovery was pretty easy. Thanks. However, I'm still having problems with the CM12 build and wifi dropping out.....still that's another story.

Related

N7 stuck at loading screen, fastboot doesn't work, recovery mode doesn't boot.

I was running ParanoidAndroid perfectly until it crashed and not it gets stuck at the loading screen of the ROM (not the Google logo). I'm able to turn it off and get into Bootloader. From there if I choose Recovery mode, it gets stuck at Google logo.
If I plug it into the PC while in booatloader, it gets detected as "Android" but no driver (I'm sure I installed it before with the Toolkit). Toolkit just won't detect the device anymore, keeps getting stuck at the <waiting for device> command.
If I plug it into the PC while stuck at the ParanoidAndroid loading screen, I see MTP and Nexus in Device Manager but w/o drivers.
What can I do now? Any input is appreciated.
Thanks.
Bump.
Itaintrite said:
Bump.
Click to expand...
Click to collapse
Have you tried fastboot from the bootloader? Try this(assuming Windows):
-copy your recovery image of choice to your fastboot folder on your PC.
-boot to the bootloader with usb connected.
-open cmd window and navigate to fastboot folder
-type: fastboot boot insertrecoverynamehere.img
It should boot into the recovery from there. Make sure it's the same recovery you used for your latest backup.
Edit: I just read the subject line saying fastboot didn't work. Odd that it would just stop working from the bootloader like that. Have you tried manually updating the driver? Or maybe adb when it recognizes the device as MTP?
Xentar712 said:
Have you tried fastboot from the bootloader? Try this(assuming Windows):
-copy your recovery image of choice to your fastboot folder on your PC.
-boot to the bootloader with usb connected.
-open cmd window and navigate to fastboot folder
-type: fastboot boot insertrecoverynamehere.img
It should boot into the recovery from there. Make sure it's the same recovery you used for your latest backup.
Edit: I just read the subject line saying fastboot didn't work. Odd that it would just stop working from the bootloader like that. Have you tried manually updating the driver? Or maybe adb when it recognizes the device as MTP?
Click to expand...
Click to collapse
Thanks for the suggestion, but I figured out the problem. I'm such a dumbass. I forgot that last time I did this on a friend's computer. Apparently, the toolkit doesn't work properly on Windows 8 64-bit... (at least not on mine). I plugged it into a friend's laptop running W7 and was able to flash recovery again. Smooth sailing from there. Wonder what corrupted recovery.
Itaintrite said:
Thanks for the suggestion, but I figured out the problem. I'm such a dumbass. I forgot that last time I did this on a friend's computer. Apparently, the toolkit doesn't work properly on Windows 8 64-bit... (at least not on mine). I plugged it into a friend's laptop running W7 and was able to flash recovery again. Smooth sailing from there. Wonder what corrupted recovery.
Click to expand...
Click to collapse
I've never been able to cold boot my recovery - only through the goomanager app(for TWRP). I believe it's a known bug. I can only boot recovery from the bootloader when my N7 is plugged into my laptop via usb. Power or another laptop don't count. Oddly enough, It also works if I plug it into my Galaxy Nexus via USB+OTG.
Xentar712 said:
I've never been able to cold boot my recovery - only through the goomanager app(for TWRP). I believe it's a known bug. I can only boot recovery from the bootloader when my N7 is plugged into my laptop via usb. Power or another laptop don't count. Oddly enough, It also works if I plug it into my Galaxy Nexus via USB+OTG.
Click to expand...
Click to collapse
Hm, perhaps that was the problem? But I was able to cold boot into recovery after reflashing TWRP... Anyhow, I'm glad I didn't have to restore a recovery image as I haven't made a backup since the last PA update
Itaintrite said:
Hm, perhaps that was the problem? But I was able to cold boot into recovery after reflashing TWRP... Anyhow, I'm glad I didn't have to restore a recovery image as I haven't made a backup since the last PA update
Click to expand...
Click to collapse
It worked for me only once after reflashing the recovery. Never again after that. Hopefully it gets fixed soon, but until then, I carry my USB cables with me if I'm flashing new roms
Sent from my Nexus 7 using Tapatalk 2

Stuck on TWRP without a system to boot to.

Hi, I wanted to return my g2 to stock rom because I didn't like my custom rom, so I followed the lg flash tool guide(tot):http://forum.xda-developers.com/showthread.php?t=2432476
It worked, but it was jelly bean 4.2 instead of Kit kat 4.4, so I tried to install TWRP so that I can install again a custom rom, but when I tried to backup before flashing TWRP, it wrote "backup Failed", I tried again and it wrote it again, but then the phone just stayed on the boot animation for a few seconds and didnt turn on again. After that, again I tried to do the flash tool method just to return to stock rom but now, it just doesn't work, whenever I insert the DLL and TOT file and start the installation, it goes up to 80% extremely quick and just boots up to TWRP without actually installing the stock rom. So now I'm stuck here with TWRP but without a system to boot to and no rom on my sd card to flash.
I really need help here because I have no idea how to continue.
Thanks for any help!
PriStol said:
Hi, I wanted to return my g2 to stock rom because I didn't like my custom rom, so I followed the lg flash tool guide(tot):http://forum.xda-developers.com/showthread.php?t=2432476
It worked, but it was jelly bean 4.2 instead of Kit kat 4.4, so I tried to install TWRP so that I can install again a custom rom, but when I tried to backup before flashing TWRP, it wrote "backup Failed", I tried again and it wrote it again, but then the phone just stayed on the boot animation for a few seconds and didnt turn on again. After that, again I tried to do the flash tool method just to return to stock rom but now, it just doesn't work, whenever I insert the DLL and TOT file and start the installation, it goes up to 80% extremely quick and just boots up to TWRP without actually installing the stock rom. So now I'm stuck here with TWRP but without a system to boot to and no rom on my sd card to flash.
I really need help here because I have no idea how to continue.
Thanks for any help!
Click to expand...
Click to collapse
You could load the zip you want to flash to a USB drive, then connect it to your phone with an OTG cable. TWRP can read from OTG.
Can you get into download mode? (phone off, hold up volume, insert USB cable connected to computer)
thecadman99 said:
You could load the zip you want to flash to a USB drive, then connect it to your phone with an OTG cable. TWRP can read from OTG.
Can you get into download mode? (phone off, hold up volume, insert USB cable connected to computer)
Click to expand...
Click to collapse
I just tried to do it through an OTG cable, it said that it flashed successfuly, but when I restarted it just went back to TWRP without booting up the system. Also, when I tried to wipe dalvik and cache, it said "wipe failed.". When I rebooted it said "It seems that the device is not rooted"... I really don't know what to do now And I can get to download mode.
PriStol said:
I just tried to do it through an OTG cable, it said that it flashed successfuly, but when I restarted it just went back to TWRP without booting up the system. Also, when I tried to wipe dalvik and cache, it said "wipe failed.". When I rebooted it said "It seems that the device is not rooted"... I really don't know what to do now And I can get to download mode.
Click to expand...
Click to collapse
Can you get ADB connectivity from within TWRP if you connect your device to the PC?
If so you could do the following command from your computer.
Code:
adb push ROM.zip /sdcard/Download/
Then navigate to your /sdcard/Download folder and flash the ROM.
d00lz said:
Can you get ADB connectivity from within TWRP if you connect your device to the PC?
If so you could do the following command from your computer.
Code:
adb push ROM.zip /sdcard/Download/
Then navigate to your /sdcard/Download folder and flash the ROM.
Click to expand...
Click to collapse
When I try to do ADB sideload on TWRP, it just loads forever and doesn't do anything... So I cant get ADB connectivity.
PriStol said:
When I try to do ADB sideload on TWRP, it just loads forever and doesn't do anything... So I cant get ADB connectivity.
Click to expand...
Click to collapse
TWRP should detect your phone without the need for ADB sideload.
If I boot into TWRP, I can instantly run "adb devices" from the terminal my phone is picked up as a "device".
If I choose ADB Sideload, my TWRP hangs just like yours does, but if I run another "adb devices" command my device shows up in sideload mode, regardless of it hanging.
Conclusion, try running the adb commands without running sideload in the first place.
Edit: Upon reflection, this is most likely because I have created an RSA key between the PC and my phone.
d00lz said:
TWRP should detect your phone without the need for ADB sideload.
If I boot into TWRP, I can instantly run "adb devices" from the terminal my phone is picked up as a "device".
If I choose ADB Sideload, my TWRP hangs just like yours does, but if I run another "adb devices" command my device shows up in sideload mode, regardless of it hanging.
Conclusion, try running the adb commands without running sideload in the first place.
Click to expand...
Click to collapse
It just says error: device not found whenever I do a command.
Please help, I really dont know what to do.
PriStol said:
I just tried to do it through an OTG cable, it said that it flashed successfuly, but when I restarted it just went back to TWRP without booting up the system. Also, when I tried to wipe dalvik and cache, it said "wipe failed.". When I rebooted it said "It seems that the device is not rooted"... I really don't know what to do now And I can get to download mode.
Click to expand...
Click to collapse
Did you wiped absolutely everything before flashing? Do you have previous Nandroid backup you can just flash. Anyway if you connect your phone to PC while in TWRP what does your PC show. Anything?
yanis15 said:
Did you wiped absolutely everything before flashing? Do you have previous Nandroid backup you can just flash. Anyway if you connect your phone to PC while in TWRP what does your PC show. Anything?
Click to expand...
Click to collapse
I tried to wipe but it just wrote "wipe failed". I do have a back up on my computer but for some reason when I try to connect my phone to my computer through an OTG cable, it doesn't find the backup. And my pc doesn't show anything when I connect my phone.

Flashing ROMS

Evening i was trying to install Remix OS backed up my Current set up took out the SD Card copied the IMG over and the craddle breaks that holds the micro SD card.....
Currently i am left with TWRP win and recoverable IMG.
I have installed Superboot to my MAC tried in terminal to get it pick it up but nothing.
i can get to no drivers screen but as soon i try to run adb nothing anyone got any advice
cheers in advance
You won't get ADB to run in Fastboot mode. Follow the instructions in the recovery thread:
http://forum.xda-developers.com/mad...overy-twrp-2-8-2-0-recovery-mad-catz-t2973640
Make sure you have the TWRP.img in the same folder as the fastboot command and boot to the image on the computer, not the MOJO.
kevinthefixer said:
You won't get ADB to run in Fastboot mode. Follow the instructions in the recovery thread:
http://forum.xda-developers.com/mad...overy-twrp-2-8-2-0-recovery-mad-catz-t2973640
Make sure you have the TWRP.img in the same folder as the fastboot command and boot to the image on the computer, not the MOJO.
Click to expand...
Click to collapse
Alright Mate
when i run super boot in Terminal i can do anything. I tried looking for devices and i get command not found if i try to flash a rom i just get permission denied its like the box isnt there
As it says in the linked thread, boot the MOJO to the recovery image located on the PC. Then flash the ROM of choice to the MOJO using the recovery.

ADB drivers

hi guys, my computer ( wins10) donset read adb device.
but i i use fastboot commands its able to list my devices, but ' adb devices' shows none listed? i am suck, might have soft brick it, able to boot into stock recocery. any suggestions?
oneplus 5 phone.
What are you trying to do?
Rhoban said:
What are you trying to do?
Click to expand...
Click to collapse
Was trying to update , but got stuck at boot screen .
Just flash the stock ROM with the stock recovery.
I can’t sideload it, “ adb not working “
Rhoban said:
Just flash the stock ROM with the stock recovery.
Click to expand...
Click to collapse
Files all courupted
With stock recovery you can't use adb sideload in windows 10.
If you're unlocked i would flash Codeworkx TWRP, download the OOS 5.0.1 Full Rom Zip, boot into TWRP, copy the zip to your phone or sideload the zip.
If you're not unlocked (and thus being unable to flash twrp) use windows 7 and sideload the zip.
You can download ADB drivers here
Can you boot? Turn on USB debugging , make sure that you allow the device when booted.
Do an advanced devices when in the OS make sure it's there.
Then you can install a TWRP recovery and do what you need to.
maikvitesse said:
With stock recovery you can't use adb sideload in windows 10.
If you're unlocked i would flash Codeworkx TWRP, download the OOS 5.0.1 Full Rom Zip, boot into TWRP, copy the zip to your phone or sideload the zip.
If you're not unlocked (and thus being unable to flash twrp) use windows 7 and sideload the zip.
You can download ADB drivers here
Click to expand...
Click to collapse
Hi bro, I am unlocked ! I mange to find a win7 pc. I ran both commands “adb devices” and “Fastboot devices”
Both shows me my devices number hence drivers are working fine.
Now do I flash twrp and sidleload? Because I can’t sideload in stock “error: *cant read zip*”. Do advice me!
PS: can boot into OS, no OS in system only recovery . USB debugging was on before boot loop happens! Thanks for all advices !
maikvitesse said:
With stock recovery you can't use adb sideload in windows 10.
If you're unlocked i would flash Codeworkx TWRP, download the OOS 5.0.1 Full Rom Zip, boot into TWRP, copy the zip to your phone or sideload the zip.
If you're not unlocked (and thus being unable to flash twrp) use windows 7 and sideload the zip.
You can download ADB drivers here
Click to expand...
Click to collapse
dladz said:
Can you boot? Turn on USB debugging , make sure that you allow the device when booted.
Do an advanced devices when in the OS make sure it's there.
Then you can install a TWRP recovery and do what you need to.
Click to expand...
Click to collapse
Hi ! USB debugging was turn on before boot loop happened. Can’t boot into OS , only recovery
lolitsryan96 said:
Hi bro, I am unlocked ! I mange to find a win7 pc. I ran both commands “adb devices” and “Fastboot devices”
Both shows me my devices number hence drivers are working fine.
Now do I flash twrp and sidleload? Because I can’t sideload in stock “error: *cant read zip*”. Do advice me!
PS: can boot into OS, no OS in system only recovery . USB debugging was on before boot loop happens! Thanks for all advices !
Click to expand...
Click to collapse
be sure your bootloader is unlocked
turn your phone into fastboot
open command prompt to the folder your twrp is in.
rename the twrp image file to recovery.img
do the following command: fastboot flash recovery recovery.img
after that boot into recovery
press adb sideload
on the computer, open command prompt to the folder where your zip file is in.
rename the rom zip file to rom.zip
do the following command: adb sideload rom.zip
done!
Thanks bro, I shall update you on the situation once I done, at work now.
Do I need to “open command promt “ at my sdk folder/plat-form tools?
maikvitesse said:
be sure your bootloader is unlocked
turn your phone into fastboot
open command prompt to the folder your twrp is in.
rename the twrp image file to recovery.img
do the following command: fastboot flash recovery recovery.img
after that boot into recovery
press adb sideload
on the computer, open command prompt to the folder where your zip file is in.
rename the rom zip file to rom.zip
do the following command: adb sideload rom.zip
done!
Click to expand...
Click to collapse
hi bro, sideload failed i think, i cant find sideload file. when the sideload end. its gave x1.00 something like that.
maikvitesse said:
be sure your bootloader is unlocked
turn your phone into fastboot
open command prompt to the folder your twrp is in.
rename the twrp image file to recovery.img
do the following command: fastboot flash recovery recovery.img
after that boot into recovery
press adb sideload
on the computer, open command prompt to the folder where your zip file is in.
rename the rom zip file to rom.zip
do the following command: adb sideload rom.zip
done!
Click to expand...
Click to collapse
attach image, successfully sideload but phone still in bootloop?
lolitsryan96 said:
attach image, successfully sideload but phone still in bootloop?
Click to expand...
Click to collapse
you need to wipe everything before flashing
maikvitesse said:
you need to wipe everything before flashing
Click to expand...
Click to collapse
just wipe, now re-sideloading. how it works. bloody nightmare dude.
maikvitesse said:
you need to wipe everything before flashing
Click to expand...
Click to collapse
still stuck at the boot loop, any advice
maikvitesse said:
you need to wipe everything before flashing
Click to expand...
Click to collapse
hi brother finally did it!
my oneplus 5 was encrypted totally forgot about hence need to wipe full back to factory stage, learn my lesson the hard way really grateful for your help!
ps; i am going to Holland on may-june for my euro trip! any places of interest in Holland?
lolitsryan96 said:
hi brother finally did it!
my oneplus 5 was encrypted totally forgot about hence need to wipe full back to factory stage, learn my lesson the hard way really grateful for your help!
ps; i am going to Holland on may-june for my euro trip! any places of interest in Holland?
Click to expand...
Click to collapse
nice good to hear!
haha, well tourists like Amsterdam so do visit that and visit The Hague/Scheveningen. I like these 3 places the most I think. Look up TripAdvisor for good attractions once you're there. do visit 'The Amsterdam Dungeon' don't miss that, I liked it very very much!
how to install the drivers?
maikvitesse said:
With stock recovery you can't use adb sideload in windows 10.
If you're unlocked i would flash Codeworkx TWRP, download the OOS 5.0.1 Full Rom Zip, boot into TWRP, copy the zip to your phone or sideload the zip.
If you're not unlocked (and thus being unable to flash twrp) use windows 7 and sideload the zip.
You can download ADB drivers here
Click to expand...
Click to collapse
Cannot adb to the phone in FASTBOOT. adb devices shows nothing when in FASTBOOT, but shows the device when in normal boot.
Hence I cannot upgrade TWRP from 3.2.1-1 to 3.2.3-0. Was trying this so to upgrade from beta23 to the beta 26, now 27 with which 3.2.1-1 seems to have problems.
A 2nd approach, just re-installing beta23 without Magisk18 gives the stock recovery which manages the beta27 install. But then I'm blocked from a Magisk18 install and still cannot use FASTBOOT mode to put TWRP back on.
Thought the adb drives could be old and sought new drivers, even assuming your link is to the most current I don't know how to get my Windows7 to use the zip file. Can you assist? This would let me put the latest TWRP, hence install Magisk18 and be rooted again!

Google Pixel 3a (sargo) brick - error boot prepare

Hi,
Today I wanted change my recovery. I had the Lineage OS recovery, but i was trying to install the twrp recovery.
So, the guide of twrp says that you should boot the twrp via fastboot boot twrp.img and install via the booted twrp. But I mistaken the command and I wrote fastboot flash boot twrp.img, I tried to reboot and the device booted himself in fastboot with the enter reason "error boot prepare" and I can't boot into the system or recovery.
I tried to flash the official image downloaded from the Google Developers website, but when i run ./flash-all.sh, console get stuck. I waited for about 15 minutes but nothing. I tried even the official Android Flash Tool but after 10 seconds it says "Your device stopped responding. You may have to select restart in the bootloader menu in order for it to be recognised again."
Does anyone know how to help me? Thanks in advance.
GioPan_ said:
Hi,
Today I wanted change my recovery. I had the Lineage OS recovery, but i was trying to install the twrp recovery.
So, the guide of twrp says that you should boot the twrp via fastboot boot twrp.img and install via the booted twrp. But I mistaken the command and I wrote fastboot flash boot twrp.img, I tried to reboot and the device booted himself in fastboot with the enter reason "error boot prepare" and I can't boot into the system or recovery.
I tried to flash the official image downloaded from the Google Developers website, but when i run ./flash-all.sh, console get stuck. I waited for about 15 minutes but nothing. I tried even the official Android Flash Tool but after 10 seconds it says "Your device stopped responding. You may have to select restart in the bootloader menu in order for it to be recognised again."
Does anyone know how to help me? Thanks in advance.
Click to expand...
Click to collapse
Do you have tryied to run the official google tool in Windows to try to rescue it?
Estebiu said:
Do you have tryied to run the official google tool in Windows to try to rescue it?
Click to expand...
Click to collapse
Yes, I wrote in the post, I tried both the command line tool and the chrome version. Btw i'm on linux
Okay so, I fixed.
For anyone who will have this problem you just need to flash official Android 9 and next Android 10. Only with Android 10 you can use fastboot flash boot recovery.img (you can't use twrp in android 10 with the Pixel 3a)
GioPan_ said:
Okay so, I fixed.
For anyone who will have this problem you just need to flash official Android 9 and next Android 10. Only with Android 10 you can use fastboot flash boot recovery.img (you can't use twrp in android 10 with the Pixel 3a)
Click to expand...
Click to collapse
I'll try this...
GioPan_ said:
Okay so, I fixed.
For anyone who will have this problem you just need to flash official Android 9 and next Android 10. Only with Android 10 you can use fastboot flash boot recovery.img (you can't use twrp in android 10 with the Pixel 3a)
Click to expand...
Click to collapse
Does this work if adb not working? I only have fastboot.
WriteLovey said:
Does this work if adb not working? I only have fastboot.
Click to expand...
Click to collapse
It depends if your pc were authorized, if it was, you can use fastboot to flash the stock version of Android 9, just running the flash-all(.bat) script.
GioPan_ said:
It depends if your pc were authorized, if it was, you can use fastboot to flash the stock version of Android 9, just running the flash-all(.bat) script.
Click to expand...
Click to collapse
I'm not certain I understand what you mean by PC authorized? I'm using a Windows 10 tablet. When the phone is attached to the computer it sees it as a device that can be disconnected through USB.
WriteLovey said:
I'm not certain I understand what you mean by PC authorized? I'm using a Windows 10 tablet. When the phone is attached to the computer it sees it as a device that can be disconnected through USB.
Click to expand...
Click to collapse
All is well. I'm back on my Pixel, yeah!
GioPan_ said:
It depends if your pc were authorized, if it was, you can use fastboot to flash the stock version of Android 9, just running the flash-all(.bat) script.
Click to expand...
Click to collapse
I just had an encounter with this. I was rooting my device (Pixel 3A) and messed up my partitions through accidentally attempting a downgrade which broke all my ****. I was unable to easily reset this device to factory, so it took me several days to figure out and root. I'm getting better though as a hacker, because a year ago this would have taken me a month.
I was able to enter recovery mode (lying down Android, NO COMMAND). From this recovery mode, adb devices -l recognized my device, although I was unable to get a shell.
At first, ADB was telling me the device was authorized, but I messed with a bunch of other stuff (tried to flash a bunch of different partitions and monkey around in general trying to install Magisk) and then ADB started telling me it wasn't authorized when I used devices -l.
Once it said unauthorized, I was unable to issue the device any commands with ADB, so I just used hardware keys to get into recovery mode. From there, I selected OTA update, and it got into sideload mode. At that point, I used adb sideload with the OTA package that I downloaded here https://developers.google.com/android/ota
^^^ That operation did successfully restore my device to factory
This following guide here describes the details of how to use hard keys to enter recovery on this phone (don't download anything from there tho, and make sure your adblock is on)
How to Hard Reset your new Google Pixel 3a [Tutorial]
In this article, you will learn how to start your Google Pixel 3a up into the Recovery Mode and perform the Hard Reset to make it work perfectly again.
thedroidguy.com
I just wanted to say, I've been wrestling this hardbrick for a couple of days with my Pixel 3a.
I've finally overcome it by sideloading the most recent OTA update after using a hard key combo to get into recovery mode. The hard key combo is hold Power Button, tap Volume Up, then release both. Then, all you need is to use the command:
adb sideload <OTA.zip>
^^^OTA wasn't the actual filename though, you can download OTA packages for Pixel 3A here: https://developers.google.com/android/ota
the OTA binaries are NOT the same as the factory images, which is here
Factory Images for Nexus and Pixel Devices | Google Play services | Google for Developers
developers.google.com
Sideloading the OTA package brought my phone back from only having fastboot and recovery mode, even when flash-all.sh from the official downloaded firmware failed. Now I know how to undo damage that I cause by rooting this thing. Since I sideloaded newest firmware, it was also like applying an update. I easily got root after that, and I've logged the process. I'll make it into a guide soon
I'll just note that if you accidentally flashed the TWRP boot image instead of simply booting into it, I believe all you have to do is flash the stock boot.img to fix the problem. Obviously you can sideload the entire rom image, but that shouldn't be necessary.
Using the Windows computer (or whatever computer you are sending ADB commands from), download the full stock image directly from Google. Unzip it and then upzip the folder inside. You should find the boot.img file inside that folder. Take that file and then flash it to the phone using the normal ADB command: fastboot flash boot boot.img
While I haven't tried this myself recently, it should work in theory. The command "fastboot flash boot twrp.img" flashes the boot partition with a non-working twrp image, so replacing the faulty image with the stock boot.img should fix the problem.
If I did the same I would first attempt to manually put device in bootloader/aka fastboot mode then fastboot flash the stock boot.img , sudo fastboot flash boot boot.img --slot all
I only read the op (first post here);but I betcha that would have worked. Then sudo ./flash-all.sh and let it do it's thing.

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