SmartESS WiFi Plug Pro 05 for solar inverter, cannot reset user!

Описание: SOLVED:    • SmartESS WiFi Plug Pro 05 fixed cloud conn...  

I've seen several reports on the internet for this issue, I even went as far as opening the thing to look for a hardware reset switch, whish is not there!
I can't for the life of me register anymore, as it looks there is a user already branded on this dongle which prevents any new registrations. The original login I saved isn't working (or maybe I forgot it), I reset app data, reinstalled, but nothing helps.