Find salt from hash - password

[Snoopy]

if you have admin rights and or access to this router, the best thing would be generating examples with known usernames and passwords and extract the data from the file/tabel you mentioned

first of all, why do you think its sha1 (your initial question)

there is no need for hashcat to support all types of vendors if they stick to some standard hashalgorithms which are already supported by hashcat