Didn't realize it was a Pi5. Pi5 requires a different kernel for the new SOC on the Pi5. Check with the author of HAMVOIP and see if they may have a Pi5 version.
Get
Plain Jane Linux (Debian, Ubuntu) OS's will boot on the Pi4 (MMC boots just fine). If I use the SAME adapter on my Pi5 with ANYTHING other than my Hamvoip image, it will boot just fine. I think it has something to do with the way Hamvoip loads the bootstrap. Unknown.
