I have a Linksys WRTSL54GS that I can't do anything with or to.
I'm pretty sure it was OpenWRT on it. What version? I have no idea. I can't remember the last time I used the router, but it's at least 2 years ago. (It's been in a drawer since we moved to the new house in 2017.) When I turn it on, the power LED blinks rapidly for startup. (How fast? So fast I can't count, so I don't know if it's 2.5, 5, or 10 hertz.)
Pressing the RESET button with a paperclip has no effect. I've tried pressing it for 10 seconds and releasing it and there's no indication of change. I've done the same by starting with the router off and holding it for 10 seconds after I turn it on. I've done the same (holding for 10 seconds) just after turning it on and as soon as I can. (The LED starts blinking immediately on power-up.)
I've tried holding that reset button for 10 seconds in every combination I could think of. I also tried all the same combinations with the EASY SETUP button, just in case. No change.
I can see the SSID show up on my iPad when the router is on. When I plug a CAT5 cable from the WAN connection to a switch on my LAN, I don't see anything new show up on the list of DHCP leases from the DHCP server. (My LAN does not use the 192.168.xxx.xxx address space. I don't know if that could be an issue or not.)
One time I was able to log on (With an iPad) to the wifi network from this router, but could not pull up 192.168.1.1. I tried turning off wifi on my Mac and connecting my Mac to the LAN side of the router (and making sure my networking settings specified to listen for a DHCP address). No joy.
Most of the time I can't even join the wifi network from this router because I get a "No internet connection." I also connected the WAN directly to my internet router. (My house is set up so I have my ISPs router, then a CAT5 connection to an embedded system running PFSense as a firewall and DHCP server. There are no systems connected to my ISP router directly, everything is inside the more protected LAN shielded by the PFSense firewall. The ISP router uses a 192.168.xxx.xxx address space, but the main LAN is all under PFSense and in a different address space. I had thought maybe using the router where the DHCP would be using the 192.168.xxx.xxx space would help - it didn't.)
We're renovating an old barn that was on this lot when we bought it and I want to add wifi down there. While I have other plans, so this is only a temporary fix, it'd be nice to return this router to a useful state. So if I can force it to clear everything and work under OpenWRT again, that'd be great, but I'd be just fine with a factory reset, too.
Right now it's useless, so I just want to find a way to get back control over this router, whether it's under OpenWRT or the Linksys OS.