Once Ubuntu loads:
Restart your PC and enter your BIOS/Boot Menu (usually F12 , F2 , or Esc ). Disable in BIOS settings. Select the USB drive as your boot device. Run the Jailbreak : download checkra1n for windows ios 12.5.5
A tool to "flash" the ISO file onto your USB drive. Download BalenaEtcher . Once Ubuntu loads: Restart your PC and enter
Here’s a concise, factual review of trying to — based on the actual compatibility and limitations of the tool. checkra1n usually recognizes it immediately).
Use a standard USB-A to Lightning cable. USB-C to Lightning cables often fail to enter DFU mode.
If checkra1n says your device is not supported, go to and check the box for "Allow untested iOS/iPadOS/tvOS versions." (Note: Since iOS 12.5.5 is older, checkra1n usually recognizes it immediately).
