Dell H625cdw Scanner not detected on Linux (Linux Mint 19.2)

Dear community,

I'm using a H625cdw all-in-one printer/scanner which - after a lot of hassle though - works okay on Windows.

I've now switched to Linux Mint and the printer worked immediately and without any problems. I can't get the scanner to work at all though.

SANE can't detect anything and I can't install the official Dell drivers.

Any suggestions?

Thanks in advance.