The only way I got my pocket edge to update was using this link on the forums here
http://dustyfeet.com/edge/p-update.zip.ermine-0.9.zip
The one on the Entourage site did not work (I tried it many,many times on mine)
I had to format the USB to FAT (not FAT32) and be shure to uncheck quick format. Now, rename the file "update"
Next uncheck the hide file extensions button (I found out how with an online search for my windows version), then transfer the file now titled update.zip to the USB.
Follow these instructions from the entourage web site.
4. Verify your edge/pocket is OFF.
5. Insert the USB stick into a USB port on the device.
6. While holding down the MENU and ROTATE buttons on the LCD side of the device, press the power key.
7. Continue to hold the MENU and ROTATE keys down for 10 seconds. 8. After 1-2 minutes you should see an "Updating software" splash screen.
13. After ~15 minutes the device will reboot and will be running the Ermine BETA build.
I just bought a second one for my wife and it worked the first time this way
Hope this helps!!