See my previous posts for more details on the programmer that I used to read and write to the flash chip. No idea to copy the dump of The individually calibrated ART parttion. Did you physically just remove the flash chip and if so why and how did you put the changes onto the bootloader? After looking on traces.. Hooked with logic analyser and noticed that there are signals on some pins of header and some of them correlate very well with LEDs blinking. Hi Craig, what you are doing is awesome, indeed. Since the OS image had been modified, I first needed to figure out the checksum for the firmware update file.
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Hi, James Shaw, Sure it can. First, I could simply set a breakpoint on this conditional branch and zyxel p-320w the register contents so that the recovery image is never loaded.
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There zyxel p-320w two solutions to this problem. What this means is that Zyxel p-320w would have to enter JTAG debug mode after the PLL was configured, but before the reset button was checked; a race condition that was difficult to reliably to win.
Hi Craig, what you are doing is awesome, indeed.
February 5, at 9: Your email address will not be published. Is there any way to make a donation to support your research? See my previous posts for more details on the programmer zyxel p-320w I zyxel p-320w to read and write to the flash chip.
Or I can buy any of your products, if you sell something. February 5, at 2: On both routers i have 0. May 2, at Recent Posts Defcon On ZyXEL jumper zyxel p-320w ok. And yes, I re-soldered zyxel p-320w chip afterwards. June zyxel p-320w, at Having patched the OS, I needed to write it back to the flash chip. This one has two which according to Cisco RF engineer is for redundancy, but with the two built-in zyxel p-320w 2dbi zyxel p-320w should be of little effect.
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. November 12, at After looking on traces. July 18, at 2: I traversed paths from pins to micro controller.
No idea to copy the dump of The individually calibrated ART parttion. I soldered headers on JTAG port and tried to connect with flyswatter and openocd. According to the datasheet, this will:. June 4, at Luckily both were relatively easy to fix.
Zyxel p-320w a reboot, lo and behold, JTAG was up and running without issues:.
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Paypal or Webmoney would be best, if you can send me the recipient details by email. May 1, at That way we can zyxel p-320w run a better zzyxel, like dd-wrt or OpenWrt. I especially appreciate that you develop highly innovative open source software such as for zyxel p-320w the reaver.
It turns out that it is a standard CRC32 checksum that is stored in the firmware footer:. So i think I have similar issue as you described. As seen zyxflthe bootloader checks the reset pin, and if asserted, it boots into a recovery image instead of booting the main image:.
Zyxel p-320w being a PITA, this approach turned out to be impractical due to the following piece zyxel p-320w earlier code:.
Hi Craig, thx zyxel p-320w a cool write-up! Not wanting to de-solder the flash chip yet again, I opted to apply the patches via a firmware update. Did you physically just remove the flash chip and if so why and how did you put the changes onto the bootloader? Thanks in no small part to copious debug strings littered throughout the code and zyxel p-320w leaked Atheros datasheetsI made zyxel p-320w progress in statically disassembling the code.
zyxel p-320w Hooked with logic analyser and noticed that there are signals on some pins of header and some of them correlate very well with LEDs blinking. May 1, at 2: So i thought i gonna try what you mentioned: Neither of this seemed to work.
This is just a one bit change to the instruction opcode:. Missing R 0-ohm jumper. Just connect to this p320w zyxel p-320w than TDO pin?
Since the OS image had been modified, I first needed to figure out the checksum for the firmware update file. All pins are directly connected to the chip. zyxel p-320w