Leave a Reply Cancel reply Your email address will not be published. February 5, at 9: This is just a one bit change to the instruction opcode:. Hi Craig, what you are doing is awesome, indeed. Desoldering the flash chip and overwriting the bootloader with this patch got me past the bootloader and into the main OS:. Did you physically just remove the flash chip and if so why and how did you put the changes onto the bootloader? Luckily both were relatively easy to fix.
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First, I could simply set a breakpoint on this conditional branch and change the register contents so that the recovery image zyxel p-320w never loaded.
There were two solutions to this problem. Having patched the OS, I needed to write it back to the flash chip. Hooked with logic zyxel p-320w and noticed that there are signals on some pins of zyxel p-320w and some of them correlate very well with LEDs blinking.
February 21, at 7: After a reboot, lo and behold, JTAG was zyxeel and running without issues:.
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After looking on traces. Not wanting to de-solder the flash chip zyxel p-320w again, I opted to apply the patches via a firmware update.
Desoldering zycel flash chip and overwriting the bootloader with this patch zyxel p-320w me past the bootloader and into the main OS:. On ZyXEL jumper is ok.
Re-enabling JTAG and Debugging the WRTN â€“ /dev/ttyS0
November 12, at Is there any way to make a donation to support your research? This is just a one bit change to the instruction opcode:. Missing R 0-ohm jumper. Thanks in zyxel p-320w small part to copious debug strings littered throughout the code and some leaked Zyxek datasheetsI made good progress in statically disassembling the code. Neither of this seemed to work. May 2, at February 5, at 2: Zyxel p-320w, I opted to simply patch the bootloader on the flash chip.
Just connect to this pin zyxeo than TDO pin? As seen previouslythe bootloader checks the reset pin, and if asserted, zyxel p-320w boots into a recovery image instead of booting the main image:.
Re-enabling JTAG and Debugging the WRT120N
Hi, James Shaw, Sure it can. And yes, I re-soldered the chip afterwards. According to the datasheet, p-3200w will:. Leave a Zyxel p-320w Cancel reply Your email address will zyxrl be published. So i thought i gonna try what you mentioned: Luckily both were relatively easy to fix. June 18, at Besides being a PITA, this approach zyxel p-320w out to be impractical due to zyxel p-320w following piece of earlier zyxel p-320w. July 18, at 2: Hi Craig, what you are doing is awesome, indeed.
No idea to copy the dump of The individually calibrated ART parttion. February 21, at 1: May 24, at 7: However, this means that JTAG is likely being disabled in software.
May 1, zyxel p-320w 2: I especially appreciate that you develop highly innovative open source software zyxel p-320w as for example the reaver. P-320ww 4, at The checksum field itself is 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.
Hi Craig, thx for a cool write-up!
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Zyxel p-320w or Webmoney would be best, if you can send me zyyxel recipient details by email. See my previous posts for more details on the programmer that I used to read and write to the flash chip.
That way we can zyxel p-320w run a better firmware, like dd-wrt or OpenWrt.
So i think I have similar issue as you described. Did you physically just remove the flash chip and if so why and how did you put the changes onto the bootloader? Recent Posts Defcon Or I can buy any of zyxel p-320w products, zyxel p-320w you sell something.
It turns out that it is a standard CRC32 checksum that is stored in the firmware footer:.