Backdoor to activating USB Debugging?

My new rooted BLU Energy X E010Q is stuck in bootloop. I suspect an evil update got through because I did not consciously allow it when I saw it on the list. It was a B-Mobile WiFi update --that returned an error. I am not even a B-Mobile (Japan) customer. I had recently installed a T-Mobile SIM card, but had not yet activated it. I installed some apps and backed them up to the SD card, but do not see any system files on it.

I could not find any internal system backups via Android Recovery, and I suspect this invader turned off USB debugging, because my device is no longer visible via my PC. Reinstalling the driver made no difference.

I can backup the bad system and see that file via recovery, but can't connect to the PC even when I can manually assign the drivers for it from my PC's my device list. The device properties show it is working, but it does not appear in windows explorer. I removed the SIM and SD cards, rebooted, then reinstalled the SD card with no difference. Still stuck in a bootloop. The techs I had look at this can't flash anything either.

Is there a backdoor hack that turns on USB debugging via Android Recovery or some other way? Otherwise this new BLU is a hard brick.

Thank you in advance for any assistance leading to a solution.