Not all the devices get Windows Mobile 6 upgrade. Dell users are the unlucky one to get that officially. Apparently most users do want the upgrade, but you know, Dell didn’t release any announcement yet. No hope? Not really as there are so many great and dedicated developers in the world, here we comes, the unoffical Dell x50v WM6 Upgrade. Many users reported that it works perfectly but try it at your own risk.

Steps from xda-developers

1) Unpack files from archive into root of FAT32 SD-Card.
2) Insert the SD-Card into your Axim and start the SD Image Loader by Pressing Wireless + Power + Reset
3) The Image Loader will search for flash images on your SD-Card.
4) Press the action key twice, this starts the update process.
5) After the process is finished you will be asked to hard reset your device. Follow this instruction and wait for the OS to load.

(via xda-developers)