
I'm sure there's a perfectly reasonable explanation as to why someone would want to hack his operation system, but I prefer to stay on the safe side by only telling you that
someone managed to extract the live ROM from his Dell Axim X50/51 Pocket PC device, to modify it, and to upload it back without completely trashing it.
If you want to take your chance, check out these links:
The long awaited solution on how to use the SD Image Loader for flashing
How to create your own flash images for your Axim
grab_it - invisible ROM dumper