Failing to root Motorola Milestone 2.1

Hi guys...
Trying to root Motorola Milestone 2.1 with no success. Really frustrating...

I am doing all as i should - cant get it done. I dont need another guide on how to root, whent over it a lot of times, made sure i am doing all as needed...
- made sure sdcard is mounted
- Swiched phone off
- Opened RSD lite 4.6 as administrator
- Phone on bootloader
- Opened SPRecovery with RSD - Clicked start - Failed....

Thats what i'm getting:
"Failed flashing process. Phone(0000): Phone is not compatible with multi-interface super-file.(0x703B) phone is connected"

Any ideas?
Please help, thanks a lot!