@sermountain I see many occurences of this kind of problem on the Github site, such as https://github.com/ubports/ubports-installer/issues/2412 the reference in this post is on this forum and then it goes to a blog post (here: https://rubencarneiro.github.io/rubencarneiro.io//Volla-phone-Repair/) that links itself to a Mediatek flash tool that is reported to work. It's complicated, however I can't directly help you I have a Fairphone myself. Good luck.