Really Dead iPhone

Used Zibri.com (latest) to unlock 1.1.4, and everything was working fine, except lost uTube. Restored to 1.1.4 via iTunes and worked fine with ATT sim. again used Zibri.com to unlock, and uTunes was gone again, but every thing else worked fine.

Then downloaded music via the dock from iTunes. In the midst of the download, the iPhone got very hot, and the battery icon came on, showing mostly discharged, with a red battery. Disconnected from the dock, and watched the battery go down to nothing, and the iPhone went totally black forever.

Of course, I tried all the reset methods, but nothing. Finally, I sent it off to a battery replace outfit, and they report that the logic board is toast. They say they tried three different known good batteries, but no response from the phone.

Do you think that Zibri did it?