How and what to flash for EC-R3568PC

BadNews

Good afternoon!

I have an EC-R3568PC. There is no firmware on the website https://en.t-firefly.com/doc/download/page/id/141.html. I want ubuntu. Where can I download it?

Problem number two - my hands are faster than my thoughts. I connected the EC-R3568PC to the computer via OTG and switched ADB to LOADER in RKDevTool and flashed ubuntu from AIO-3568J. Now Ubuntu starts on EC-R3568PC, but USB doesn't work. And now I can’t connect to RKDevTool (even the device manager in Windows does not show anything when connecting the EC-R3568PC). How can I reconnect the EC-R3568PC to RKDevTool?

BadNews

Stop panic!
I opened the seal and disassembled the device. There is a LOADER button (and there is also a MASKROM). I uploaded firmware from ROC-RK3568-PC SE. USB works, ethernet and wi-fi work. So far no problems.

Firefly

Please check this again: https://en.t-firefly.com/doc/download/141.html