Root Un-root phone

[BadSectorGR]

Hi all,
I got a Motorola Milestone that is rooted (info below) and I want to un-root it.

Can I just connect the phone via USB to my PC and use the Motorola Software Update tool and update firmware? Or this can make the phone a brick?

Root info:
1) I live in Greece (Wind is my provider)
2) Mod Version: CyanogenMod-7.2.0-RC1-umts_sholes-KANG
3) Under settings > about phone > Firmware configuration version I can see this:
Baseband version: 3GSMEPU91A_U_91.09.04I

Thanks all.

 

[AntimonyER]

Hey BadSector, just a heads up, I moved your thread to the All Things Root section. Thanks for understanding.