FWIW I asked the OP to send me the /etc/shadow file which he tried to bruteforce with John The Ripper (unsuccessfully). And because it contains old school UNIX

FWIW I asked the OP to send me the /etc/shadow file which he tried to bruteforce with John The Ripper (unsuccessfully). And because it contains old school UNIX crypt() hashes I was able to crack the root pw in ~7 hours with hashcat on 12 x RTX 4090: the root password is Newt@rd$ Not that it's particularly useful as this device let's you gain root access via TCF anyway without authentication. But maybe this password is reused in other areas...