I used to have an option in my linksys admin page to enable UPnP... Then a technician came in to fix some problem i was having with my wireless router and i think he updated the firmware of my WRTP54G to firmware 12.0.1-r110407-3.7.2. It used to have a blue and white layout on my admin page and now it is kind of black and yellow and there is NO option to enable UPnP. Is there a way to revert back to that blue and white layout firmware version where UPnP was available?

SOURCE: I Upgraded RV042 to latest firmware from Linksys Site and now Router Continually reboots

i think there might have been some sort of virus(spyware, adware, trojan)

SOURCE: BEFSR81 admin problem when enabled uPNP

in the router has one rest pin just press it for 3 min then after try to logged in but remind u have to configer agin

defolt ip is 192.168.1.1
user: admin
pass:admin

try it

SOURCE: BEFSR81 admin problem when enabled uPNP

I actually FOUND the solution at the linksys community forum site. It's weird, and I quote [kiefmoon], "I beat my head against this issue for the past few months, for the same reason as you: I'd built out a Windows Home Server, which can configure a home router automatically via UPnP, so I happily enabled it on the router, only to be locked out of the web-based configuration page.

Good news though! I just figured out the cause of the issue -- and it's really dumb:
You turn on UPnP on the Passwords tab, right? Well, if you look around on that page, you'll notice that, along with the option to enable UPnP, there are two password fields filled with asterisks. I think most people would assume that if they don't change anything in those fields, then click Apply, that the password has not been changed. And they'd be wrong. I don't know what the password gets changed to at that point, but it's not "admin".

...So the fix is: when you enable UPnP, do yourself a favor and enter a password in those fields (ideally something sronger than "admin" ). That way, you'll actually know what the password is when you get prompted for it."

SOURCE: WRTP54G not routing

turn the power off for 5 minutes then try.
if still pro let meknow.

SOURCE: Cannot find wireless tab on Linksys router setup page

Hi...this is an unusual problem.

Is your model the BEFSR41W? Linksys describe this as a 'wireless ready router', and it seems to require a PCMCIA card to be inserted in the back of the router, to enable wireless connectivity.

I'm just wondering if the router lost communication with the card, causing your wireless options to disappear?

However, first things first. As you have (correctly) reset the router, all your settings have been cleared, including ISP information (hence the internet connection is lost). Your first priority is to set up your router again, and the Linksys website has a downloadable manual, quick install guide and tips which will help with this.

When you are up and running - and assuming I have the right model - try removing and re-inserting the PCMCIA card at the back of the router, and see if the router re-detects it. If successful, this should bring back your wireless options.

I hope this helps, but please post again on Fixya if not. It does seem odd to have lost the wired connection before the reset.
Good luck. :)