Default [Q] need help

Hello everyone.can you help me..my phone (Galaxy s2) was bought in saudi arabia, now i'm in the philippines i don't know what firmware to upgrade to..can i use any firmware?thanks in advance for those who can help me...this is the version of my phone
PDA: I9100JPKF3
PHONE: I9100XXKF1
CSC:I9100OJPKF2