Question [Q] Changing the CSC

I currently own a SM-N9905 from the Philippines that is currently locked to a carrier.

Baseband: N9005XXUDMJ7
PDA: N9005XXUDMJ7
CSC: N9005OLBDMJ2

1. Can I change the CSC to another region so I can update to 4.4.2?

2. Will Knox 0x0 be tripped if I do so?

3. (a longshot question) If I manage to change the CSC will the phone be unlocked?