Fix ‘No Service Issue’ iPhone 4 BB 1.59.00 with Ultrasn0w 1.2.8 On iOS 6.1: Many iPhone 4 users who have updated to their iDeivice firmware to iOS 6.1 and tried to unlock with Ultrasn0w 1.2.8 must have faced ‘No Service Issue’. This issue occurs due to iPhone 4 with baseband 1.59.00 have some major compatibility issue with ultrasn0w 1.2.8 and iOS 6.1 firmware.
Users will notice the following symptoms on their iPhone 4;
- It cycles between “no service” and one bar signal with 3G.
- Every 20 seconds it pops up one bar for your network and then returns No service.
At the time there is no working solution available to solve this issue but we recommend all iPhone 4 with Baseband 1.59.00 to downgrade to iOS 5.1.1 firmware. Downgrading to iOS 5.1.1 firmware is only possible only if you have saved your SHSH blobs.