Step 1: Download s1tools
here and extract.
Step 2: Remove your phones battery and reinsert it.
Step 3
pen s1tool and click on identify now connect your phone and follow the instruction
(For NEO V press and hold back button and u will see the following message as shown in screenshot)
Step 4: When u got above message click on 'RESTORE' when the restore process completes remove the cable and reinsert your phone battery.
Step 5: Downlaod flashtool
here and 4.0.2.A.0.62 Firmware
here and extract it.
(Note:for flashtool tutorial click
here)
Step 6: Flash the .tft file according to the tutorial and restart your phone, your phone will definitely start
(Note: After restoring, your phones bootloader will be locked, again u have to unlock to install custom kernels or roms.)[/QUOTE]
Sent from my Xperia Neo V using xda premium