3GS Old bootrom and 3.1.3
I need something clearing up...
I've always been under the impression that the 3GS cannot be untethered on 3.1.3 without pwnage - however, I've since read and been told that the bootrom is hard-coded and cannot be upgraded with a firmware update...so...
I'm currently on 3.1.2 JB, with SHSH's stored on Cydia... Can I..
Update to standard 3.1.3 (Officially unlocked so no worries about baseband) and then get an untethered JB using redsn0w 0.9.4?
If not, can I using a custom 3.1.3 with Pwnage...?