Permanent Unlock for Lumia 710 and 800 via USB

You need ATF 10.40

1. Flash Qualcomm OSBL to Phone

2. Unlock Phone via eMMC Direct

3. Power On phone and enter PIN code '00000000'

4. Wait until Signal Appears then power off phone properly

5. Connect again with eMMC Direct, then click "Disable RE-Locking" button

6. Click "Restore DLOAD" if you plan to flash phone in future...