I've read through this board, but can't seem to find a solution to my problem. I have no problem finding and downloading the file from the Cisco web site. When I log into my wireless router and go to the Administration- Firmware Upgrade page, I select the file. Even though I select Hardware version 1.0, the file name is: FWWRT54Gv44.21.5.00.bin. The file name appears to specify Hardware version 1.0. Could that be the problem? The error message I receive after hitting the Upgrade button is: Upgrade are Failed!
By the way, there is no hardware version 1.5 for WRT54G2. There's version 1, then 1.1, followed by version 2. No version 1.5 available. I suggest that you double check the hardware version of your router (it's on the sticker at the bottom part of the router). If there's no version number printed next to the model number, the device is version 1. If the Software is software or firmware embedded on a Product, you must stop using the Product. All provisions of this Agreement except for Section 1 and the limited warranty in Section 12 (the first paragraph) will survive termination.
I used both Firefox and Chrome and receive the same error message. My current firmware version is 1.0.04 and I'm trying to upgrade to version 4.21.5. Are there any known issues when anyone else tried this upgrade? If so, any known fixes or workarounds?