Some notes on how to reflash a bricked Proxmark3 over JTAG.
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The RDV4 repository contains helper scripts for JTAG flashing.
apt-get install openocd
tools/jtag_openocd/openocd_configuration
by copying tools/jtag_openocd/openocd_configuration.sample
CONFIG_IF
to refer to your JTAG tool. openocd_configuration.sample
contains several examples and is set up by default to work with the J-Link.cd tools/jtag_openocd/
./openocd_flash_recovery.sh
In some rare situations, flashing the full image over JTAG may fail but the bootloader could be fixed. If it's the case, you can flash the image without JTAG by booting on your fresh bootloader (possibly forced by pressing the Proxmark3 button).
For advanced usages there are also openocd_flash_dump.sh
for dumping the content of the Proxmark3 and openocd_interactive.sh
for an OpenOCD console.
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The RDV4 JTAG header is quite smaller compared to other Proxmark3 platforms.
If you're using a J-Link, there is a convenient adapter made by Proxgrind.
You can also make yours with some 1.27mm headers (look for 1.27mm header
on Aliexpress) or Pogo pins or buy an already made clip, e.g. search dykb clamp
on Aliexpress and take a 1.27mm single-row 6P version.
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J-Link pinout:
Pin cut-out on a JLink 20 pin connector
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-------------- ---------
|19 17 15 13 11 9 7 5 3 1|
|20 18 16 14 12 10 8 6 4 2|
-------------------------
Map of pins between PM3 / JLink
PM3 | JLink
--- | -----
TMS | 7
TDI | 5
TDO | 13
TCK | 9
GND | 6
3.3 | 2
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RPi pinout:
PM3 | RPi
--- | ---
TMS | 22
TDI | 19
TDO | 21
TCK | 23
GND | 6
3.3 | 1
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There has been lots of articles and blogposts about recovering, debricking, JTAG your Proxmark3 and you find here below an assortiment of resources that will be of help.
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https://stackoverflow.com/questions/48794076/error-halt-timed-out-wake-up-gdb/64291913#64291913
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Describes the SEGGER JLINK, JTAG process but be warned, this document is old. https://github.com/RfidResearchGroup/proxmark3/blob/master/doc/original_proxmark3/Compiling%20Proxmark%20source%20and%20firmware%20upgrading%20v1.pdf
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