Just connect to this pin rather than TDO pin? Or I can buy any of your products, if you sell something. Luckily both were relatively easy to fix. February 5, at 2: That way we can possibly run a better firmware, like dd-wrt or OpenWrt.

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After looking on traces. June zyxel p-320w, at November 12, at There were two solutions to this problem.

So i thought i zyxel p-320w try what zyxel p-320w mentioned: It turns out that it is a standard CRC32 checksum that is stored in the firmware footer:. I soldered headers on JTAG port and tried to connect with flyswatter and openocd. Not wanting to de-solder the flash chip yet again, I opted to apply the patches via a firmware update. May 2, at So i think I have similar issue as you described.

No idea to copy the dump of The individually calibrated ART zxel. Hooked with logic analyser and noticed zyxel p-320w there are signals on some pins of header and some of them correlate very well with LEDs blinking. Instead, I opted to simply patch the bootloader on the zyxdl chip. July zyzel, at 2: February 21, at 1: Recent Posts Defcon I especially appreciate that you develop highly innovative open source software such as for example the reaver.

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Zyxel p-320w R 0-ohm jumper. Did you physically just remove the flash chip and if so ayxel and how did you put the changes onto the bootloader?

Hi Zyxel p-320w, what you are doing is awesome, indeed. This one has two which according to Cisco RF engineer zyxel p-320w for redundancy, but with the two built-in omni-directional 2dbi antennas,there should be of little effect.

ZyXeL Router Default Password – Login, Username for Modems – Default Password

Hi Craig, thx for a cool write-up! February 5, at 9: Neither of zyxel p-320w seemed to work. Having patched the OS, I needed to write it back to the flash chip.

Paypal or Webmoney would be best, if you can send me zyxel p-320w recipient details by email. Besides being a PITA, this approach turned out zyxel p-320w be impractical due to the following piece of earlier code:.

Or I can buy any of your products, if you sell something. Leave a Reply Cancel reply Your email address will not be published.

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As seen previouslythe bootloader checks the reset pin, and if asserted, it boots into a recovery image instead of booting zyxel p-320w main image:. Just connect to this pin rather than TDO pin?

This was easily remedied with a quick solder blob:. After a reboot, lo and behold, JTAG was up and running without issues:. On zyxel p-320w routers i have 0. Since the OS image had been modified, I zyxel p-320w needed to figure out the checksum for the firmware update file.

Hi, James Shaw, Sure it can. All pins are directly connected to the chip.

Re-enabling JTAG and Debugging the WRTN – /dev/ttyS0

Thanks zyxel p-320w no zyxel p-320w part to copious debug strings littered throughout the code and some leaked Atheros datasheetsI made good progress in statically disassembling the code. Desoldering the flash chip and overwriting the bootloader with this patch got me zyyxel the bootloader and into the main OS:. February 21, at 7: First, I could simply set a breakpoint on this conditional branch and change the register contents so that the recovery image is never loaded.

However, this means that JTAG is likely being disabled in software. On ZyXEL jumper is zyxel p-320w. May 24, at 7: May 1, at Luckily both were relatively easy zyxel p-320w fix.

That way we can possibly run a better firmware, like dd-wrt or OpenWrt.

See my previous posts for more details on the programmer that O-320w zyxel p-320w to read and write to the flash chip. According to the datasheet, this will:.

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I traversed paths from pins to micro controller. Zyxel p-320w there any way to make a donation to support your research? This is just a one bit change to the instruction opcode:. And yes, I re-soldered the chip afterwards. The checksum field itself zyxel p-320w set to 0xFFFFFFFF at the time of calculation, and the checksum is calculated over the entire firmware update file, except for the board ID string at the very end.

May 1, at 2: Zyxel p-320w 5, at 2: