Currently my settings on the iphone are:
- version 4.0 (8A293)
- new bootrom
- firmware modem : 05.13.04
I urgently need to upgrade it to version 5.1.1 (at least) because there are apps that don't run anymore on this version.
Is it safe to upgrade? Is it still possible to remain it unlocked ?
Can anyone show me a tutorial for that?!