A: No. The humming means the coil is getting power, but the plunger is stuck. Do not hold the button for more than 5 seconds or you will burn the coil. Use the shock method.
You must have the correct Sony Xperia drivers installed on your PC for the FlashTool to recognize your device. Step 1: Prepare Your Tools d2403 lock remove ftf
Flashtool will detect the device and begin the process automatically. Wait for the "Flashing finished" message before disconnecting. d2403 lock remove ftf