相比目前最新固件iOS 4.3，刚刚透露的iOS 4.3.1固件并没有实质性的升级，iPhone 4已经具备的无线热点功能在3GS上是否能够获得支持都还是个未知数，鉴于此建议用户静观其变，没有必要跟风升级。
- Baseband updates for the 3GS and iPad (original)
- Fixed memory hang that results in memory corruption when reading large files from USIM filesystem
- Fixed problem with NTLM authentication in apps and on websites
- Fixed issue with the Springboard and 3rd party apps not recgonizing the gyroscope on the iPad 2
- Fixed iPad 2 jailbreak vulneratbility