WRT54G2 (v1.0) has HORRIBLE wireless performance?

My WRT54G2 has been acting like crazy. It's giving me wireless speeds of 1 Mbps or less. When wired, I get about 19 Mbps on various Internet speed tests (which is what I expect from my Internet connection). I have updated the firmware which, despite the router telling me "Upgrade are failed" (another sign of great quality), seemed to make things better for a day. Now it's back to < 1Mbps wireless. I have tried several different wireless channels, power cycling, using the reset button, etc., but it doesn't change anything. I still get the same 1Mbps wireless and full-speed wired performance.
What is the deal here?
(Mod note: Edited for guideline compliance. Thank you.)
Message Edited by Vince_02 on 08-22-2009 07:09 AM

Try updating/reflashing your router's firmware and then reconfigure it...
Go to website linksysbycisco.com/downloads.........insert model no of your router in serach tab......select proper version of your router........download the firmware file......save that file on desktop
Follow these steps to upgrade the firmware on the device : -
Open an Internet Explorer browser page on a computer hard wired to the router...
In the address bar type - 192.168.1.1...Leave the Username blank & in Password use admin in lower case...
Click on the 'Administration' tab- Then click on the 'Firmware Upgrade' sub tab- Here click on 'Browse' and browse the .bin firmware file and click on "Upgrade"...
Wait for few seconds until it shows that "Upgrade is successful"  After the firmware upgrade, click on "Reboot" and you will be returned back to the same page OR it will say "Page cannot be displayed".
Now reset your router :
Press and hold the reset button for 30 seconds...Release the reset button...Unplug the power cable from your router, wait for 30 seconds and re-connect the power cable...Now re-configure your router...
If your Internet Service Providor is Cable follow this link
If your Internet Service Providor is DSL follow this link     

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