help with flashing

[flexium]

i plugged in the phone with the cable. get the red screen..but the rsd lite doesn't detect it..

i made sure it is in modem mode.
i have 06 right now
i want to flash to 08

what can i do?
please help

[varundbest]

your computer will show found new hardware first install it then run rsd
hope it will help.