You can update EROM with WotanServer (for free), just leave username/password fields blank
Connect your phone, holding "2" and "5" buttons at the same time (instead of "C" button)
Then, in WotanClient, press "Start" button, it will update your EROM to R3A016, and solve the "red led blinking" problem
Note: If the above solution doesnt work (error: Username or password incorrect), you need a WotanServer credit to do this
That file: K610_RED_CID52_R3B021_EROM-FOTA, is FOTA (Flash over the Air) update, not EROM update