Hello,
same problem here. After installing the recovery using the modified MultiROM version I can't boot to recovery anymore. You see the boot logo, but as soon as the TWRP logo should come up, the phone reboots to system.Also posted on github.

That sounds very well!

What's the status of the Ofono thing? I would highly enjoy mobile internet for services like Telegram. Actually, once that and the headphone jack is working, I would use it Adresse a daily driver.