Its fairly easy to upgrade Wits with latest firmware, here is how:

1. Format a microSD card using HP format tool (has to be FAT).
2. Copy the MLO file to microSD first (important).
3. Copy all the other files to microSD.
4. Power off the A81E.
5. Insert the microSD.
6. Plug in the AC charger.
7. Press and hold the left arrow key (the one next to Power On key) and press and hold the Power On key until see text top of the screen, you can release the key now.
8. The upgrade process takes several minutes. WAIT!!
9. The device will reboot (shutdown) when finished.

Latest firmware files:
http://digital8.org/downloads.php?do=cat&id=24

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