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 TuT HOW TO JTAG Samsung Galaxy Centura (SCH-S738C)

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PostSubject: TuT HOW TO JTAG Samsung Galaxy Centura (SCH-S738C)   Fri Aug 01, 2014 9:05 pm

JTAG Samsung Galaxy Centura (SCH-S738C)
Contents
1 Samsung Galaxy Centura SCH-S738C
1.1 Getting Started
1.2 NAND Dump Procedure
1.3 Notes
1.4 References
Samsung Galaxy Centura SCH-S738C
This phone is supported by the Tracfone network and uses a Qualcomm MSM7625A 800 MHz Snapdragon (S1) Processor. The phone has 4 GB of internal storage with a Samsung KMSJS000KM B308 MoviNAND flash memory chip. This phone is unsupported by RIFF Box for the JTAG process but can be imaged with the direct access plugin.


Getting Started
What you need:


Riff Box
USB to Micro USB cord

NAND Dump Procedure
Remove the rear cover, exposing the 7 phillips head screws.
Remove the screws and the rear plastic casing with a plastic pry tool.
Remove the two molex connectors attached on the right and top of the printed circuit board.
Remove the printed circuit board from the screen casing exposing the nine TAPS on the reverse side. Note the small copper carrot indicating the direction of the TAPS.
Connect the RIFF box to the JTAG pins.
Connect the PCB to a Micro USB cord and power via a power supply.
Start the "RIFF box" software.
Power the PCB.
Dump the NAND.
S738C back.JPG
S738C case.JPG
S738C molex.JPG
The TAPS order is as follows:

1=GND
2=NRST
3=TDO
4=TCK
5=TDI
6=TRST
7=RTCK
8=TMS
9=N/A

S738C TAPS.JPG
Test has shown for the best results and fewer read errors, use short wires directly to the RIFF box ribbon interface.***
S738C riff.JPG
After the wires are connected to the board, the phone is powered by the USB connection. Plug the Micro USB into the USB connection on the device and then plug the phone into the USB port on the laptop.


Launch the Riff Box JTAG Manager and use the following settings:


Navigate to the Useful Plugins tab
Select the Direct JTAG Access to Flash Memory Plugin. Note the directions displayed in the window along with supported processors.
Activate the plugin
Choose the MSM7627A from the drop down menu on the right side ** Note this is not the processor but it will allow access the the memory.
Select eMMC SDC3 (via chipset) from the Memory Type & Host drop down.
Check Auto FullFlash size
Select Connect & Flash ID. ** This will not flash the memory chip initially, but will only connect**
Choose the read button from the bottom left corner. This will connect to the device and display the partitions and chip ID.
Active plugin.JPG
SCH-S738C Setting2.JPG
SCH S738C Setting2.PNG
Notes
The phone has a 4GB MoviNAND flash memory chip which should take approximately 24 hours to download. This takes much longer the normal because the direct access plugin functions at a much slower speed then normal JTAG methods. Test have found using shorter large wires and no intermediate PCB board increases performance.

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