I ended up forcing a shutdown (by holding the power button for 10 seconds) while the green bar and Garmin logo was still on. Then I removed the SD card and started up the unit again. Everything seems ok and the SD card contains the backup file 41_backup.bin.
One suggestion for the instructions in post # 337: In the instructions it seems like you should put the following text in the update.txt file:
rrgn,41,1:/41_backup.bin
reboot
but the "reboot" command is not recognized according to the update.log file. So the only text that should be in the update.txt file is:
rrgn,41,1:/41_backup.bin
EDIT: SOLUTION WAS FOUND. See Post # 525. Reboot command is valid. I had a space after "reboot".
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