How to restore my bricked Lumia 1320?

[gsanath]

I was testing Windows 10 mobile in my Lumia 1320 phone. Even after three months no stable version was released. As I tried to restore OS 8.1 the phone stopped working and is now dead. Refuses to power on. All soft and hard resets don't work.
Tried Nokia Software Updater for Retail but Unable to connect to server. In offline mode, it says my phone is not supported. Can you help me to restore the phone ?!

 

[charlatan1978]

If you can't get it to power on then you will be unable to restore it.
Can you try leaving it connected to the charger for a couple of hours and then try a soft reset?

Even after three months no stable version was released

The last few builds are pretty stable, at least for me they are on my Lumia 930 and 535.