how to reset apple tv if stuck between internet disconnect. I am getting iTune logo and apple tv cable on my tv screen and apple tv flashes light

Hi

I have stoped updating apple TV because I forgot my wifi password when asked during update.

After 2 days when I have started appleTV, the iTune logo and appleTV with cable displays on my TV screen and appleTV keeps flashing light.

It seems to me that it is stuck in between updating and unable to connect with my home wifi.

How can I get reset the appleTV with existing version?

Thanks a lot!

Mrugesh