i successfully use your code like this

but after that i tried to enter this code but it gives me error

it gives me error that " Invalid Argument "

after i use your code sfdisk -uM /dev/mmcblk1 << EOF my N900 say

but i know this Unsupported is due to i format the memory card to other format.. now i want to know how will i do after i use your CODE

then i want to insert this code

but in the line of "umount /dev/mmcblk1p1" it gives me error Invalid Argument..

any idea?