The editor is most reliable on GT5 Update 2.11 . Versions later than 2.12 (such as 2.14) introduced security features that can prevent hybrid mods from working or cause file corruption.
Before opening Bruteforce or the Garage Editor, copy your unedited GT5.SAV file to a secure folder on your PC. If the file gets corrupted, you can restore your original progress. GT5-Garage-Editor-V131
Even for an offline game like GT5 (PS3), distributing or detailing such tools risks encouraging cheating, save corruption, or console bans (if used on modded consoles still capable of connecting to PSN). The editor is most reliable on GT5 Update 2