I figure maybe with a Maxi Sys scan folder backup, after update period is up and you only have issues with one certain car make's software on the tablet you could delete that one car make software on the tablet, go to the Scan folder Backup on your PC , surgically cherry pick the car make software , copy it to the Micro SD card , then copy and paste the car make files from the Micro SD card to the scan folder on the Maxi Sys and surgically repair the maxi sys single car make , rather than deleting the entire maxi sys scan folder and hoping to replace it with the entire scan folder backup saved on your PC., then the scanner system likely not give you authorization to access diagnostics any longer.
Are you able to have two versions of GM or other makes side by side on the menu screen to access, so you don't have to delete one version to replace with a older version saved to PC?