Hi,
Thanks…and…so…
I successfully upgraded my phone from Q (e-1.8.1-q-20230206257879-dev-a5y17lte.zip) to R (e-1.19.1-r-20240110372392-dev-a5y17lte.zip WITHOUT losing my data
- To do this, I first made a backup of my phone with this tutorial :https://community.e.foundation/t/howto-backup-and-restore-data-on-android-devices/23292
- I have deactivated the unlock code on my screen.
- And with adb
adb reboot recovey
- On TWRP : Advanced → ADB Sideload
- On PC :
adb adb sideload e-1.19.1-r-20240110372392-dev-a5y17lte.zip
- then reboot system
I had a problem with the sound card at the beginning. I repeated the procedure to downgrade to e-1.17-r-20231111351093-dev-a5y17lte.zip, reboot system and upgrade again to e-1.19.1-r-20240110372392-dev-a5y17lte.zip. The sound problem has been corrected as below.
Good luck to you