Getting Waydroid to work on the Pinephone Pro

[Dragonborn]

Hello

I try to install waydroid on mobian (on SD) with tow-boot on SPI.

After insert psi=1 in /etc/default/u-boot, i launch sudo u-boot-update, then i reboot PPP.
But psi=1 doesn't appear with the command cat /proc/cmdline

Any suggestions ?

Hmm, I did not have this issue. It showed up first time for me after the reboot. Make sure the file is saved and cat the config file before you run sudo u-boot-update to make sure it is in the u-boot config. I suppose it is possible the phone isn't saving your changes for whatever reason. If you didn't use sudo to write the file that could be the culprit. Just be careful updating the config too many times, let me know how it goes.