Review your settings. Click the blue button at the bottom right. A confirmation window will appear warning you about potential data loss. Click Flash anyway to start the process.
: Legacy hardware maintenance. This feature is heavily restricted and functional only on legacy hardware running iOS 7 or earlier (e.g., iPhone 4, iPhone 3GS) that rely on software-based carrier unlocks. Step-by-Step Guide to Executing Pro Flash
| Error Code | Meaning | Pro Solution | | :--- | :--- | :--- | | | USB interruption | Use a USB 2.0 port on the back of your PC. Avoid hubs. | | 3194 | SHSH Blob mismatch | You are trying to flash an unsigned iOS. Only "Retain Data Flash" works if currently on that OS. | | 4013 / 4014 | NAND corruption or cable fault | Try a different cable. If repeated, your device likely has hardware damage (logic board). | | -1 | Baseband failure (iPhone 7 common) | This is hardware. 3uTools cannot fix it. |
Flashing (restoring) an iOS device carries a risk of failure. Always backup your data first. pro flash 3utools
: Performs a thorough, permanent sanitation of the internal flash memory storage blocks.
Once the green "Success" message appears, your device will reboot. If you used "Retain Data Flash," all your data will still be there. If you used iTunes Flash, you will see the "Hello" setup screen.
The Ultimate Guide to Pro Flash on 3uTools: Master Advanced iOS Flashing Review your settings
Click on the tab at the top of the 3uTools interface. Select Pro Flash from the left-hand menu.
Best for beginners, quick updates, and simple restores. It automatically selects the latest firmware and settings.
Wipes all user data and performs a clean installation of the OS. Best for fixing system glitches or preparing a phone for resale. Click Flash anyway to start the process
: Useful for older devices needing to keep specific cellular firmware. ⚡ How to Use Pro Flash : Install the latest on your PC. : Link your device via USB and open Flash & JB Query compatible (SHSH) to see which iOS versions you can flash. : Download the desired firmware and click Import Firmware
A specialized mode used primarily to repair system files when a device is stuck in a boot loop or Recovery Mode. 3. SHSH Querying
This mimics iTunes behavior. It downloads the latest signed iOS firmware (IPSW) from Apple’s servers and performs a standard restore. It’s safe for general users but offers no advanced capabilities.