For example without connecting to internet ??

They put that I did'nt instal the USB driver but I don't find it (HP).
Please, do you know how to find it ?
Thank you

@MrT10001 said in Just upgraded but stuck on google screen:

Download the link file and extract it where your fastboot and adb files are

Im not getting it : there are a looot of files in this folder and it is a chaos for me

Yes Im in the fastboot mode but I don't understand what it is.
I see in the last line : "enter reason : error booting boot.img"

When I plug it to my computer it puts "Android Device" then "Android Bootlaoder Interface" (Device Manager) but I don't know what to do with it...

Thank you for being here. I watched a video where the process is done in 20 minutes. For me it is, for now, 3 days
yayyy

If you can all, is not lost. You need some tools:

Fastboot and ADB drivers

Pixel 3a this version: 9.0.0 (PQ3B.190801.002, Aug 2019) from here

Pixel 3aXL this version: 9.0.0 (PQ3B.190801.002, Aug 2019) from here

Download the link file and extract it where your fastboot and adb files are. Open a terminal in that folder.

Then with the device connected at the bootloader screen to the PC run the flashall.sh file in the terminal.

Once Android is set up and working. Follow the instructions on the installer to install UT.

Please read this.

I have the same (or similar) problem.

Now my phone is stuck : navigating with the buttons (power and volume) I reach only 2 screens : google logo + bootloader (without the options of the volume buttons).

My fault : I figured out that I forgot to downgrade to V9 android
(Am I wrong?).

Yesterday I began this new OS installation and I spent 5 hours to not get it _ _ '

I don't know what to do now , my phone is dead or ...?

Please someone help me, thank you