I’ve taken a belts and braces approach to solving this problem, and the solutions should be in the next update.
Firstly, I’ve ensured that re-installing OSMC in the future will configure the UBoot environment to match the defaults provided by the bootloader that is packaged:
So in your case onwards, if you were missing that hdmimode parameter, it would be reinstated automatically after reinstalling, which would solve your issue.
I’ve also got a patch to solve the original crash which occurred when that parameter wasn’t set. It’s been verified by a user but I’ll wait for a bit more testing before pushing it to the development repository.
Thanks for the report
Cheers
Sam