@Qurious AX1800 could either AX20, AX21 or AX23. To be able to determine the correct model, region and HW version, you should look at the device bottom sticker. Once you've done that, you should...

@Chazman On the login page, you should have the option to use the local admin account:

@David-TP Thanks for pointing that. I was thinking about a local link IP address with FE80::/64 prefix.

@rossack Check this thread - your issue could be the same as the thread's OP.

@Galicia86 You can't - there's no such option. A link local address with prefix of FE80::/64, is not routable, and can be used for communication only on the local network. You can only disable WAN...

@SpyTr4ck I believe that C80 limit for Address Reservation is 32 records. And I would bet that if you factory reset C80 and add them from a spreadsheet backup, will work for you. After all it's up to...