i know you wanna close this topic but i have something to add here.
After i flashed my TV 2 or 3 times (don`t know exactly) with modified firmware i noticed that my TV says there was no firmware backup.
I checked the path you mentioned in the wiki (Ensure the backup exe.img ( stored on /dev/tbml10 ) is in good condition ( and ideally not altered. ) )
but there is no folder just an 60MB file.
Maybe disabling the RSA also disables the backup progress.
As precoution i suggest every 2nd or 3rd flash should be an original unaltered firmwareimage, havent tried it, bust should work.
As adittion i installed an FTP server on my TV, if someone needs files from an 37" B650 CI+, just ask