Done flash of “Software binaries for AOSP Android 11.0 – Kernel 4.14 – Seine (latest)”: I choose this release because the kernel is the same, as first try. My device is Xperia 10 ii dual sim.
The flash by fastboot took 48 seconds.
Phone restart took 3 minutes but went without issues and prompted with security code request.
First issue: the homescreen start took three additional minutes
Second issue: bluetooth was not recognized (no button in shortcut menu, no HCI0 item in RFKILL)
Third issue: no SIM recognized.
Wifi worked fine, also browser and camera were working fine as with “originary” SW_binaries_for_Xperia_Android_10.0.7.1_r1_v12b_seine
I shut off the phone, restarted in fastboot mode and flashed back the originary binaries.
The phone booted quicker as usual, and everything works fine.
One note: Bluetooth was not starting, I needed to send systemctl restart bluetooth.service