Sign [Q] f240 stuck on miui with no root and no computer connection

Hi,

After having a few issues trying to install a kitkat rom on my new g pro I bearly saved it and now somehow I have a MIUI rom on it.

That could have been fine if not for a few annoying problems.
1. there is no root access anymore
2. I can't use any Launcher Apps
3. I can't apply Morelocale 2 to change the language
4. The computer does not recognize the phone anymore (just charge)

Can any of it be solved? TIA