Sammy drives can be a bit of a pain. to do it without soldering (HIGHLY RECCOMEND) you need a via sata card. VT6421A OR VT6421L.
you also need an editord MTKFLASH.EXE and MTKFLASH.TYP files for the via cards.
once got these this is how I did mine.
Format USB stick and make it bootable. copy the xtreme42a.bin onto it
also copy x360sam.exe, mtkflash.exe and mtkflash.typ onto there.
power down pc and xbox 360. dissamble 360. and wire sata lead from it to the pc. keep the power connected. its also reccomened that you attach a wire from the pc case to the xbox 360 case. metal -> metal. as a grounding point
once done that. follow these steps..
1) power on the 360 (Make sure video lead is in too)
2) power on the PC, boot from usb stick
3) at the command type mtkflash r /m orig.bin
4) press return. and wait for it to give you options of port to select. you want
VIA (DONT SELECT IT YET)
5_ At the selection screen, power down the 360.
6) Press the number for via on the pc. and it will seem to hang.
7) Power up the 360 and the pc should start to read the f/ware from your drive.
** MAKE A BACKUP OF ORIG.BIN WHEN FINISHED. **
8) Type x360sam xtrem42a.bin orig.bin hacked.bin
9) wait for it to finish. and power down the 360 and the PC
10) Power up the 360
11) power up the PC, boot from USB stick
12) at the command type mtkflash w /m hacked.bin
13) wait for via select. power down 360
14) select via. wait and power on 360
at thsi point your drive will flash. wait for it to get to 100% on all 4 banks.
15) power down pc and 360. reassemble 360. and njoy backups
Hope it helps.
Fuas