Info 2 [Q] How to find my correct firmware?

Hello,

I am looking to find the correct firmware for my Samsung Galaxy Grand Duos.

Phone was purchased online shipped from Hong Kong and it is manufactured in Vietnam. I live in UK. Phone was unlocked to all networks.

I do have a nand of stock rom but looking at recovery.log shows 4.2.2 for some reasons. I am 100% sure that, this particular backup was done when i was on stock 4.1.2.

I am really confused now. Any help?

Thank you !