Apple watch recovery failure

The apple watch show me the watch and iphone icons and ask for recovery, i put it on the charger and get it near to the iphone where it asks me to recover, i enter the pin numbers and it starts to recovers , when it is near complete or just going to finish the recovery it reboots again and the recovery failure and again it show the two watch and phone i ons and asked me to recover it agian.

i tried to recover ot thousands times and from different iphones and it always fails and restart the process just before it finishes the recovery?

what can i do ?