Well i have no idea mate. As for Burnout you should extract the update packages and copy their folders namely "TROPDIR" and "USRDIR" from the updates to the game. Then change the PARAM.SFO of the game to HG game and the App ver to 1.90. And just rename the PS3_GAME folder to BLES00455 and inject that folder to your backup. It should start without any problem after you restore it.
BTW go from 1.70 to 1.80 to 1.90 and if it asks you if you would like to overwrite it click yes.
BTW go from 1.70 to 1.80 to 1.90 and if it asks you if you would like to overwrite it click yes.