My friend has a C902 currently with AO_R3CA033 firmware. I would like to put on the latest R3EA038 firmware but noticed it says AS_R3EA038. I have heard that C902 comes in AO and AS variations. Will I brick my friend's phone if I use A2 uploader and this AS firmware? The latest EUROPE firmware that says AO is R3DA028, should I use that one instead?

Thanks
Darren