Something really weird happened. It turns out I had used supposedly the proper firmware. I am located in Bulgaria, Europe but somehow I have the US version of the router. When I used the US version...

Indeed it was clear that SOME version is not correct but I never thought that the country version is the one that is not matching. I was thinking about the build version (180114) was wrong. Thank you...

I am trying to upgrade my firmware version with Archer C7(EU)_V2_180305 or Archer C7(EU)_V2_170803 but I get the same error with both firmware bin files: I have no idea what is wrong and how to fix...