Update Failed and locked Prime

[minus1]

I updated the new CK & VC version 10637 okay. When I tried to update the Prime from the CK menu Help-Update Calculator the following happened:
The prime started the download in the V13 recovery mode, and when the blue progress bar was all the way to the right the Prime went black, i.e. will not turn on, will not reset, with the various methods posted by TW. Can someone please shed some light on this issue of losing USB Comm during the download process. It's not the USB port or cable and it's not the battery. I am looking for a systematic procedure to get the Prime back to life. Everything was working before the upgrade.

Please see my previous post on 05-26-2016, 08:18 AM.

Thanks,
minus1