Go to eBay. Look for JTAG service. You'll have to find a JTAG service that can work on that phone. You'll probably have to contact a lot of the ones listed to find one that will be able to work on an UMI. Or you can contact UMI at
service@umistores.com and ask if they can recommend a service either near you or that you can send the phone to.
Considering the price of the service plus shipping and insurance both ways versus the price of an X1, it might not cost much more to just buy a new phone.
The phone turning off during a flash probably corrupted the partitioning to the point that you can't do anything through the microUSB port any more. (If this had happened during an over the air update it would be the carrier's fault, because it's a known failing of the way Android does OTA updating, but since you did it yourself it's your responsibility.)