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I followed these steps:
Download EdgeTouring_290.gcd from http://gawisp.com/perry/edge/ to your PC
Rename EdgeTouring_290.gcd to GUPDATE.GCD
Copy GUPDATE.GCD to the folder ..\garmin on the Edge Touring* while device connected through USB - device will have got a drive-letter.
Disconnect device from PC (advice: using the safe procedure - system tray)
Turn on and it asked "do you really want to update to this old firmware" - pressed Tick!
Done!
This took a bit of trial and error - I get two drives loading when I plug mine in, so have a couple of plain "garmin" folders. Just added it to each one until it worked!
Ps - And to prevent update to version 4.00 again: Every time Garmin Express has synced the device to Garmin Connect there will be a file GUPDATE.GCD in the ..\garmin folder on the device. Just delete it every time before detaching the device from your computer.
I'm getting all this from here
How did you roll back to 2.9? I was looking for info on that to pass on, but couldnt find anything...