it is, if the secureinfo_A region doesn't match or if its missing the system will not boot, and if its been edited (some people change the region manually in the file) and then the user uninstalls a9lh the system is bricked as without a valid signed secureinfo_a file the system cannot boot into anything, even safe modeI don't think it's a system vital file though. In that, some things won't work but it'll still boot, with the mismatch - still looking for sources on that though