The Phone Service Berlin shop today replaced the display of my Volla22 phone. The display appears to work, as far as can be judged by looking at the fastboot screen or recovery image screen, or the installation screen ("installing system image").
However, the installed Volla Phone 22 with new display (mimameid_h12) firmware does not boot. After installation, and whenever I switch on the phone, the phone is stuck in the bootup greeting screen showing volla~~~ in white letters on black screen.
In that stuck state, a short press on the power button just switches off the phone. Is this the Volla phone's boot loader?
Note that this problem cannot be explained by phone damage. Before the screen was replaced, the phone did boot and work "normally" with the standard Volla firmware image. And the same "stuck at boot" problem already happened when installing the "Volla Phone 22 with new display" firmware on the not yet repaired phone. Just at that time I attributed the failing boot to the firmware not being compatible with the old display (see post above).
edit: the phone now booted, after installing the "devel" channel of the Volla Phone 22 with new display (mimameid_h12) firmware.
I also created a dedicated topic for the problems concerning the Volla Phone 22 with new display (mimameid_h12) firmware image:
https://forums.ubports.com/topic/10395/ubports-firmware-for-device-volla-phone-22-with-new-display-mimameid_h12-does-not-boot