Thanks to all of your for sharing of your valuable experience and i managed to flash my MPX200 with WM5 and unlock the applications.
Here's my little experience to share with all of you.
The steps of removal of SIM card (as in turk's movie) is very important. I have tried for 2 times (with both Kingston 128 and SanDisk 512) and the OS get stuck until i remove the SIM card and redo the steps.
My Kingston 128 work just fine as SanDisk.
For the compatibility with Dig Camera, my way is to copy everything in the card after flashing of WM5 to PC; format the mem card with dig cam and copy all the file back to the card. You can dup iit to as many card as you want.. and all my cards work.