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I've an old ASUS DSL-N14U | What I can do?
(lemmy.ml)
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
https://www.asuswrt-merlin.net/ as a first step.
It isn't on the list. There are maybe old releases for legacy hardware?
Oh, you're right. In this case: https://freshtomato.org/
Same? I think this hardware is so useless that don't even worth it to build a custom firmware. :D
Oh wow, apparently I didn't see the "DSL" in the model name. You could try to figure out whether it is physical identical to another model that doesn't have a modem built-in (except for the modem obviously) and use an image for that, if you don't need the modem functionality.