You have to do a hard reset which wipes memory, but it's still worth it. Who really knows what kind of bugs they fixed that they're not telling about. My system is only a week old so I jumped in and did it. Now I have A06 instead of the A01.
Another link is:
Dell Site - Drivers and Upgrades for Axim X51 and X51V
Just make sure you choose wheather you have 51 or 51v, big difference. The 51 has only QVGA while the 51v has VGA.There are also some keyboard drivers for those who have bluetooth keyboards but no need to install it unless you actually use those devices. It's a good page to watch for updates!
:)