This will upgrade your Dell Axim X5 PDA to Windows Mobile 2003. It can also back up your current software version. I have not been able to find this anywhere else.
This is Spiaatie's Windows Mobile 6.5.3 ROM for the HP iPAQ HX2000 series. It works just fine on my HX2795b. This ROM is very hard to find, and I haven't been able to find it anywhere else.Download Spiaatie's Windows Mobile 6.5 ROM