The script makes a backup copy of the original system.img in its workdirectory, you can always do it manually too just in case, but if you want to modify system part of appsupport rebuilding the img is the way to go (and you can also always follow the clean reinstall of appsupport guide to download it again from scratch, worst you can get is appsupport not starting and going into bootloop, just replace system.img with the backup and you’re good)
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