Ensure your device is running smoothly and check for any available updates.
After the flashing process completes, your device will restart one last time. You may need to activate it. Follow the on-screen instructions to activate your device.
Find and download the unsigned IPSW file you wish to install. Ensure it's compatible with your device model.
Always back up your data before attempting any firmware modification. These processes carry a risk of "bricking" your device or putting it into a recovery loop.
For any firmware manipulation, your device must be in . Connect your iPhone to the PC.
A warning will appear. If you have your blobs correctly configured, 3uTools will attempt to stitch the signature to the firmware and proceed with the installation. Common Troubleshooting Error: "Apple Has Stopped Signing"
If you see this immediately, it means you are trying to flash without SHSH blobs. 3uTools cannot bypass Apple’s server check without that digital signature. Stuck on "Verifying Restore"
If you backed up your device before the process, you can now restore your data.
Apple stops signing older iOS versions shortly after releasing a new one. Once unsigned, iTunes/Finder will refuse to restore them. However, 3uTools offers a feature called or "Easy Flash" (iTunes Flash) that can sometimes bypass this using saved SHSH blobs.
Follow the on-screen instructions in 3uTools (under the Flash & JB section) to enter DFU mode. The screen should remain black, but 3uTools will say "DFU Mode Connected." Step 3: Select the Unsigned IPSW In the > iTunes Flash section. Click the Import button at the bottom.