According to sosotiit on the xbox-scene forums, if you do the following, you will be fine:
Yes, another method to Flash/update the firmware on a Samsung drive !!
The methods doing too many steps with one command are not my favorites because I feel you loose sight of what is happening. By using the mtkflash command yourself, and assuming you do it properly , you will increase IMHO your chances of success.
Here is a method that do not use the samread/samflash of Xtreme Boot maker 3.6 or the Xread/Xflash of Xtreme boot maker 5.3. It is very similar to the approach presented by myfranco in his very good thread Step By Step Tutorial On How To Flash Ms25&ms28.
Note: Same recommendations as in the Textbook Tutorial, you should disconnect all other Sata and IDE device while you extract the orig.bin and flash the hacked.bin. You will need a VIA Sata card/chipset if you have a samsung ms28 or one of the chipset in the compatibility list of Textbook tutorial if you have a ms25.
You will need to use a USB memory stick (or floppy, or ntfs4dos) with the appropriate mtkflash on it. You can look at the Quick Tutorial: Xtreme Boot Maker 5.3 Rc1 And 3.6 to prepare your USB key and correct the firmware import error on latest Xtreme firmware.
It is also recommended that you do not use your X360 to power your drive while the sata cable is disconnected from your MB. The E64 error generated could be logged and use as an indication of a potential change in firmware. Your options are
Use a console that is already banned or 3 RLOD
Use a Connectivity Kit
Do your flash without the vidocable connected which gives you 5 minutes. This will activate the power without initiating the CPU that monitors the E64 error. If you are prepared well, this is enough time. If you take longer the x360 will shut down which is not good in the middle of a flash!!! Be sure to restart it before the flash to give yourself the 5 minutes.
Getting your orig.bin
Connect you PC sata cable to the X360 Drive (some have to do this after step 2)
start your x360 and pc to the dos prompt (using the USB key)
type mtkflash r /m /sata orig.bin
list of port will appear (if your mtkflash is correct)
Only if you have a ms28: power down your x360
select the port on your PC,
Only if you have a ms28: then count to 10 (try different count) and power your x360
the pc will read the firmware to the orig.bin file
Making your hacked.bin (reboot to Windows)
Extract the the firmware you want (Xtrem10a.bin) to a directory and rename it to hacked.bin
Open orig.bin in FW toolbox 3.1B and do ctrl-c on the key (copy to clipboard)
Open hacked.bin in FW toolbox and do ctrl-v to insert the key in the field hit 'Replace Key'
Only if you have a ms25: Go in Tool / Spoof Firmware / select 'Samsung...MS25'/Hit 'Apply Spoof'
Close and reopen hacked.bin to make sure that it is identified with its proper ID (MS25 or MS28) and that the key is present. Copy the hacked.bin to your USB key.
Note that this tutorial will also show you how to transfer your key with an Hex editor.
Flashing your hacked.bin
Connect you PC sata cable to the X360 Drive (some have to do this after step 15)
start your x360 and pc to the dos prompt (using the USB key)
type mtkflash w /m /sata hacked.bin
list of port will appear (if your mtkflash is correct)
Only if you have a ms28: power down your x360
select the port on your PC,
Only if you have a ms28: then count to 10 (try different count) and power your x360
the pc will flash the firmware to the drive (it will show the 4 banks being flashed)
To verify that it was flashed, you can use the same steps with now mtkflash r /m /sata verif.bin, and compare verif.bin to hacked.bin using (Hex editor, or crc32 in a zip file or winrar...)
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Reflashing your original firmware
Connect you PC sata cable to the X360 Drive (some have to do this after step 2)
start your x360 and pc to the dos prompt (using the USB key)
type mtkflash w /m /sata orig.bin
list of port will appear (if your mtkflash is correct)
Only if you have a ms28: power down your x360
select the port on your PC,
Only if you have a ms28: then count to 10 (try different count) and power your x360
the pc will flash the firmware to the drive (it will show the 4 banks being flashed)
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Updating your firmware to Xtreme "Latest"
With your orig.bin simply follow the steps 9 to 21
Without your orig.bin, but if you have a firmware file containing your key you can use that file in step 10 instead of the orig.bin to extract the key.
IF you do not have a firmware with your key, plse first look at How to recover your X360 drive key.
Note that if your samsung is a replacement drive for another model or you have replaced your Motherboard, then you must use the proper drive ID in the Spoof of Step 12
-If your Samsung is a ms25 and is the original drive, make sure you select the drive ID as ms25
-If you replaced your drive, select the drive ID that you had originally on that motherboard.
-If you replaced your motherboard, you need to select the drive ID that was on the MB originally.
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