The 4.3.1 issues (signal bars, etc) are fixed http://is.gd/OYktXf but need a few days to test all devices + FW (again: not a new unlock!)Note: this is not a new unlock, it's only update to ultrasn0w to work on iOS 4.3.1 for the unlockable basebands. (Not supported basebands : 2.10.04 / 3.10.01 / 4.10.01)
UltraSn0w and Signal Bars Issues With iOS 4.3.1 Fixed
MuscleNerd has just announced that dev-team has successfully managed to fix ultrasn0w , signal bar and more to work on iPhone 4, 3GS after jailbreaking iOS 4.3.1. All issues will be fixed via a new update on ultrasn0w (not Redsn0w update). Dev-team will release the new update within few days after testing all devices