![]() ![]() In the case of a failure in LLB or iBoot to load or verify the next step, startup is halted and the device displays the connect to iTunes screen. This guide states," A failure of the Boot ROM to load LLB (on older devices) or iBoot (on newer devices) results in the device entering DFU mode. DFU mode is just a fail safe when recovery mode does not work and has better control over upgrading and downgrading bypassing bootloader requirement. I believe either mode will do a fresh installation. Bootloader normally does not support downgrading because it checks to make sure firmware is equal or higher than the current firmware. Recovery mode use iBoot bootloader and normally restore the device to factory setting with the latest signed iOS firmware. (Developer should know about this more than average user because of upgrading and downgrading to test iOS beta to troubleshoot software and hardware issue). Happens when Boot ROM failed to load bootloader and can be used as a last resort. Which is it?ĭFU aka Device Firmware Update allows device to be restored from any state which also support downgrading and bypass the iBoot bootloader. But then I've seen other people claim that Recovery and DFU Mode give you a truly fresh installation that a regular restore does not. If you weren't having issues with booting then the end result would be the same as a normal Restore process. ![]() Recovery Mode - A mode in which the phone can be force updated or restored if you are having issues updating or with something else, but otherwise is the same as performing a normal update or restore.ĭFU Mode - The phone is completely erased and iBoot is re-installed, followed by the latest iOS version. Restore through iTunes/Finder - The phone is completely erased, the latest version of iOS is installed fresh. Update through iTunes/IPSW file - The entire iOS installation is replaced with the newest version or version you force selected. Update OTA - a patch file is appled to your iOS installation, making only the modifications of the new version. I know the recommended reasons for each method, but I want to know all of what happens under the hood. I'm looking for detailed descriptions of what actually happens when you use each recovery method, since Apple is not very transparent about this. ![]()
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