When I press volume down+power button it says like this:
*** LOCKED ***
MARVEL PVT SHIP S-OFF RL
Feb 8 2012, 18:29:31
I tried this method but nothing happens, it doesn't scan for any files.
Again, make sure your device is S-OFF.
Again, make sure your memory card is formatted FAT32.
Place the PG76IMG.zip file into your phone SD card.
Disable Fast Boot from your phone settings (Settings > Power > Disable Fastboot)
Turn your phone off.
Hold down the "power" button and the "volume down" button for a few seconds till you see the HBOOT screen.
Don't press anything. The system will scan for some files and it will prompt you for an update. Move the cursor to OK (volume up) to start the flashing process.
After it finishes, press the "power" button to restart the system.
Let Android boot and delete the PG76IMG.zip file from your SD card via USB.
Congrats! Custom recovery has been installed. Process to step 2.
Thanks for your help and sorry if I wasted any of your time.