I have installed iOS 8.1 and jailbroken it with Pangu8 1.1(with Cydia). Pangu8 untether version is updated to 0.2. I have disabled OTA update daemon with 'Software Update Killer'. And there hasn't been any problems with 'Software Update Killer'. http://cydia.saurik.com/package/net.crazy.updateskiller/ Everything was ok except when I have started using iCleaner 7.2.3 version which is meant for iOS 7. I was thinking that it is secure to disable OTA daemon and leave other daemons enabled. Before disabling OTA update with iCleaner Pro, 'Software Update Killer' was still enabled. So I have disabled OTA update daemon second time with iCleaner Pro and iPhone 5s doesn't start. It's like double 'disable OTA update daemon' function isn't working well. I have left iPhone to turn on and get past Apple logo. Several times it has shown blue screen. After this blue screen iPhone restarted instantly. DFU mode is working but I need to save the info from iPhone : it isn't in computer. Some of this info can't be backed up by iTunes. I can't wipe out iPhone 5s. I have tried to turn on Substrate safe mode by holding Volume Up button and it isn't working.