cannot boot from sdcard in bootloader mode...help

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Hi,
i've successfully entered in bootloader mode
but i cannot start the sd boot uprade method.
I tried with 3 different 256 sd card, with different usb writer
and to plug or not the usb cable in the magician, but every time
nothing happens. It remain in serial or usb mode or if i soft reset the device reload the old rom.
There is a method or a command in romupgrade to force the sd boot? like d2s but with reverse function??
thanks

i finally did it ..

Try to take the procedure from the beggining ,

Store the current rom to the card (dont reset leave it as it is in bootloader mode it says store completed or something), instert it in the reader , load the old backup rom in sd (DONT COPY THE NEW HEADER OF THE NEW BACKUP ROM TO THE OLD BACKUP ROM) and then insert it in your phone , press the power button and reset , let it appear the splash screen (don't enter in the wizard after the splash screen) and then enter in bootloader mode (power , camera , reset ) and wait for a few seconds (it took 5 sec to me) and the it should appear the message press power to flash.

In conclusion , to those who restore from sd doesn't work , follow the above procedure , dont try only restoring begin from backup even you dont want this rom.