@Eric-H
Hi Eric,

I switched to focal stable and the phone works much better, no more reboots when activating waydroid.

I also recovered the battery graph and I have a battery life of +/- 24 hours with normal use.

Some applications no longer work, such as the tor browser, and there are 3 or 4 sentences in the menus that aren't translated into French, but that's not a problem.

GPS works with pur map and OMS Scout server.

Thanks to the developer and the community, I use my phone on a daily basis and it works very well.

I can't wait for the next stable update, as I can already feel the power and stability of this Ubuntu focal version.

@keneda
Ok

@Salah
Hello Salah, I succeeded with TWRP that I installed with these three commands:

adb reboot bootloader
fastboot flash recovery twrp.img
fastboot reboot

Once these commands were executed with the combination of the (Volume -) and (Power) buttons, I launched TWRP. Then, in the file explorer on my PC, I opened the TWRP folder on the phone and pasted the zipped ROM inside, and then I started the installation and I found Android again. But thank you for your help