Newly purchased Pixel 3a won't let me downgrade Andoid to 9.

MrT10001

@kandjou @kandjou Put the version of Android the device was originally shipped with, set it all up. Then downgrade to version 9. Use the Chrome based Android flash tool, it is the easiest way. Once you have that installed set it up again,when install UT.

kandjou

@MrT10001 Thank you, it works!!
Then I instal UT but...

My screen does not work

I can't select the language (UT).
Only possibility is to press the buttons.
So I reboot.

Then the first thing I see is the google logo (again_ _')
Then Ubuntu charging
Then the Language setting...

I'm afraid : I bought this device new especially to install UT..
What can I do now please ?

kandjou

@MrT10001 Sorry , there is another thing : before the google logo and just after to reboot (keeping pressing the power button)
I see the bootloader screen with the careful logo and "Press power button to pause" then this text :

The bootloader is unlocked and software intregrity, etc.

MrT10001

@kandjou That is correct, that just means the bootloader is unlocked. UT won't install or run without it!

I think it is all correct what you have done, but it looks like the touchscreen issue has raised its head again... here, which you have posted in.

Try the install again with the latest developer option!

Moem

@kandjou Sorry, I don't have the knowledge. But MrT10001 is helping you, so you'll be fine.

kandjou

@MrT10001 Thank you MrT, you are helping a lot.
With the latest developer option ? Sorry, what do you mean ?

MrT10001

@kandjou on the UT installer once you have selected your device, there will be a drop down box to select which version of UT you want to install, choose 20.04 Developer.

kandjou

@MrT10001 I am there , I can see 20.04 dev

kandjou

@kandjou I did it with the option you said but the screen is not working again ..

kandjou

@MrT10001

UB Ports Installer says :

Error : unhandled rejection at [object Promise] :
Error : Failed to create run: FetchError: request to https://ubports.open-cuts.org/graphql failed reason: ECONNRESET

I don't think my screen is dead but it does'nt works for now...

Why the 20.04 devl option , you have an idea ?
Thank you

kandjou

@MrT10001 do you think we can do something with halium9 ?? (I have no idea of what it is but the ground of UT I suppose)

kandjou

@kandjou It seems many users have this screen problem

Is it possible to set the smartphone like Nothing happened.
A new one (in my case it is so because I've just bought it)
How to do that (locking the phone ? Good idea ?)

THEN, installing UT like for the first time ?

Why nobody has found the solution of this commun problem ?

arubislander

@kandjou said in Newly purchased Pixel 3a won't let me downgrade Andoid to 9.:

Why nobody has found the solution of this commun problem ?

Because no one with the skills to debug and solve it, is actually experiencing the problem. It seems to be something 'new' with recent installs of Pixel 3a(XL)'s, since about November 2023.

One thing that has seemed to work for at least one user is to disable Double Tap To Wake (DTTW) in the Settings app under Getstures -> Tap to wake.
Since your screen is unresponsive to taps, you might need to find a way to connect a wired mouse to your device and then use it to navigate to the above setting.
If you should find that it is already disabled, you might want to enable it, reboot, see if it improves anything, and if not disable it again and then reboot again. Maybe that resets some configuration that might be causing the issue.

MrT10001

@kandjou DO NOT LOCK the bootloader, you may totally brick the device at worse or cause issues making it difficult to get back at least if you don't have Android on the device.

This is what I would do:

Put Android back on the device (the one that you installed to put UT on).
Set it up

Then, as Focal (20.04) is not working for you try Xenial Stable 16.04 which is regression and see if UT works from that. Use the UT Installer and select 16.04 (Stable) in the drop down.

kandjou

@MrT10001 Thank you @arubislander and MrT1000

I am think of giving up , it's so boooring (10 days... 10DAYS, it's enough, for me so complicated it is) although I am learning about amazing tools and trics

Thank you for your responses guys !!

Now : no valid slot to boot
I could reinstall Android V9 (the good one, about that : the installer says Google Pixel 3a/3a XL (sargo) but I have a 3a XL and they put the "bonito" https://developers.google.com/android/images#bonito)

There is always some problem

kandjou

@kandjou When I connect my phone to charge, the screen become crazy, impossible to select the icone I touch.

Cl : DON'T buy a Google Pixel 3a XL

Thank you for your time

bye