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THIS TUTORIAL IS INTENDED FOR THEORETICAL USE ONLY, USE ON PRODUCTION
SYSTEMS MAY VIOLATE YOUR ISP's TERMS OF SERVICE. THEORYSHARE TAKES NO
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AND ANY EXPRESS OR IMPLIED
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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ACTIONS.
Use this tutorial to revive your bricked modem.
Things to consider 1st;
If you KNOW your printer port works with the Jtag...
If the modem does not boot up properly
The lights do not go through their regular "flashing sequence" or the
top Power light is the only one that is flashing and not of the lights
work (no coax installed for this test)
It can't read the firmware name on the 5100 tab or it comes back as all ffffffff's.
If you have an "ST" flash make sure to apply the ST patch from the download section.
Then you may have flashed over your old firmware See the picture and with the Power ON run a wire from the 3.3v leg of the power
rectifier closest to the flash chip.
To pin 1 of the Jtag port
(header removed for clarity) (the #1 Pin has a square pad on both sides
of the PCB, Top RH in this picture).
Hold it there for a couple of seconds.
Then run the 3.3v wire across each one of the Jtag pins quickly, the
lights on the modem will falsh quickly) and you may even see a small
spark (normal, but explains why you don't hold the 3.3v wire on the
rest of the pins for long, 1 second "hit" is fine)
Leave the modem powered on and connect the Jtag.
Turn off verify in Blackcat. Then flash the full 2mb dump using the Flash tab in blackcat.
(you can test the modem at this point by power off and on, if it does
not work, repeat above steps and continue, yes even the full flash)
Then turn on verify and now flash the bootloader. Then flash the firmware. Using the 5100 tab.
99% of the time at this point all modems have recovered.
Sometimes
if you have a REAL stubborn one you need to fool blackcat buy starting
it on a working modem's header then move it over to the dead modem then
force in the flash.
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