Can't get into my Chromebook after removing Family Link

phaas

Hi,
I had Family Link on the google account of my chromebook but then I removed it and deleted the family group.
But, after removing family link from a chromebook, you need to insert a parental code wich you can only get from the family group site or the Family Link App. Unluckily I had none of them.
So I tried making a new family group with my Chromebook-account in it but these parental codes aren't working.
So, I can't get into my Chromebook. The Bad thing is, I can't factory reset my chromebook because I can't backup my files. 😭
Does anyone maybe know how to Backup Files maybe "remotely" or maybe connected via a cable to another PC?
Or does anyone can help me in general with my Problem?
Thank you!