I was unfairly flagged

I have been flagged and can't play rated games.
I'm not sure why but I think it can be related to my rating increase.
I was going through my games but except for one game nothing was suspicious.
Well, I didn't play the game, my friend played it and I'm not sure if he cheated, but if the problem is with that game, I won't let him into my account.
I will be happy to answer if you have any questions.
PLS unflagge.

U are marked by lichess if you want to know the reason use www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwin47ejuI72AhX0TmwGHQ4eB04QFnoECAQQAQ&url=https%3A%2F%2Flichess.org%2Fpage%2Fappeal&usg=AOvVaw1ZIqb3jVxDRE_myv4ZArov

Thanks for help.

Regardless of whether your friend cheated, having someone else playing on your account is in itself against the TOS and can get you flagged.

Oh.I didn't know that, but he is worse then me, so I didn't even think it could be a problem. Won't happen again.

Please see lichess.org/appeal.