<![CDATA[Reverting to Stock Android 9 on Google Pixel 3a XL]]>Hello,
Some people have had difficulty satisfying this prerequisite to installing Ubuntu Touch on the Pixel 3a XL...
I had my share...!
So, in case this helps anyone:

After flash-all.sh & adb sideload methods failed with errors... and TRWP wouldn't load (fastboot boot twrp.img) or install...
I persisted, flashing individual .img files - still not booting...
TWRP eventually came up! (fastboot boot twrp.img)

  • I used TWRP to adb sideload the Google OTA Android 9 .zip (to slot a)
  • Then I used adb sideload with stock recovery (to slot b)
  • I used stock recovery adb sideload (to slot a)
  • Then I used stock recovery "Factory Reset"
  • Android 9 booted.
  • UBPorts Installer ran perfectly.

What seems to have worked for me:

  • Persistence
  • Sideloading Android 9 OTA to BOTH slots a and b
  • Factory Reset in stock recovery after all that

[I use a Linux PC; latest adb & fastboot;]
[latest version Google Stock Android 9 files]

Don't give up.
KJU

]]>https://forums.ubports.com/topic/10132/reverting-to-stock-android-9-on-google-pixel-3a-xlRSS for NodeTue, 17 Mar 2026 03:29:05 GMTMon, 20 May 2024 00:09:14 GMT60<![CDATA[Reply to Reverting to Stock Android 9 on Google Pixel 3a XL on Fri, 13 Sep 2024 11:52:50 GMT]]>Dear folks,

I have been through this topic but I really did not understand those steps how to return back to stock Android 9 in case some thing happen to my device (Google Pixel 3a XL)..

Therefore, is there any clear & easy instructions to return back to stock android 9 ??

Thanks,

]]>https://forums.ubports.com/post/81980https://forums.ubports.com/post/81980Fri, 13 Sep 2024 11:52:50 GMT<![CDATA[Reply to Reverting to Stock Android 9 on Google Pixel 3a XL on Mon, 10 Jun 2024 07:09:38 GMT]]>However, 'Android Flash Tool' by Google makes the task of restoring stock factory Android to Pixels...
So... much... easier.
(It took me a while to find it, that's all.)

https://flash.android.com/welcome

Access is by opening that website in Chrome or Edge or another of several compatible browsers.

When it completes, it offers to lock the bootloader, but that can be skipped.
KJU

]]>https://forums.ubports.com/post/80601https://forums.ubports.com/post/80601Mon, 10 Jun 2024 07:09:38 GMT