I have a 1.0.2 orginally which was unlocked with IPSF paid version. It was upgraded tp 1.1.1 and then upgraded to 1.1.3. Everything works and had to fix the sync issues at 1.1.3.

I've read that you should upgrade the BB as well, but why? What are the advantages to have a 4.0.3 BB to a 4.0.2 BB on 1.1.3 firmware?

b/c the gunlock method unlocks the phone b/c it goes from .03 to .02

theres no advantatges..its just how the unlock method works

if you're on 3.9 bootloader, you can use google maps on the .03 bb without using locateme or navizon