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DrayTek 2820n TFTP firmware problem

DrayTek 2820n router

I recently had a problem with a bad firmware update on my DrayTek 2820n router. For some reason the firmware re-flash didn't complete properly and the router could no longer be accessed via the browser web interface, even the DrayTek Firmware Upgrade utility and the TFTP programs did not seem to work. It turned out Windows 7 was blocking them and I had to turn off 'User Access/Account Control' (UAC). Here is how I did that:-

  1. If the ACT, USB & CSM leds are all flashing rapidly then the router is already in TFTP mode
  2. connect the router and pc directly together with a Ethernet cable
  3. ensure router and pc are on the same subnet ie if the router has reverted back default ip of then you may need to set your pc's network adapter tcp-ip4 properties
  4. open a command prompt and verify you are connected, ping the router
  5. find the DrayTek Firmware Upgrade Utility, right click and Run as Administrator (this is crucial under Vista and Windows 7) and answer Yes in the User Account Control popup box
  6. enter the routers ip address, the firmware file and click send.

Hope that helps.