Thanks for a quick reply!

I think I have not seen any options for bootstrapping or wiping data.

Lots of warnings for data to be wiped both when reinstalling android and while trying to install ubuntu;

Is it during the downgrading of android or while upgrading to Ubuntu that I should watch out for warious wiping options?

Thanks
R

@wgarcia
Unpack the zip file with the Android operating system that you want to downgrade to

Follow the link on the device page to get the riht zip file (google provides several versions of the same android version installation package depending on your prefered installation tool set)

@MrT10001
Regardless if I try to install 16.04 20.04 or 24.04 i get stuck in the google logo on my 3A
Yes I run de desired version of android according to the devices page

I think my recovery program is not working after the downgrade to version 9 android

All steps up to the step using fastboot works fine

Then it tries starting recovery mode and it hangs on the google logo, same result if I try to enter recovery from either power and volume-up or by using adb shell

Should I install twrp instead of the erroneous stock recovery?