Download the special firmware from nspro support area
Unzip the firmware.
-Start NsPro
-Select S5600
-Click FLASHING
-Tick "BootLoader"
-Then click BROWSE and load the BOOT_FILE folder from special firmware
-Click WRITE and fallow the software instructions.
-After operation completed, remove the battery and puth the phone in download mode again.
-Then use AUTO to select the firmware folder on NsPro
-Then flash the phone with firmware files using NsPro.
Then use nspro to unlock the phone.
After unlocking flash the phone with a different firmware (boot+firmware)