Hello,
My router Zyxel 660HW has a bad bootloader so neither the web nor the FTP nor the serial port respond. The only way to upload the bootloader would be throug the AR7 JTAG but I culn't find any JTAG conection in the board. Any ideas? Anybody had this problem before?
Thanks,
Al
JTAG in Zyxel 660HW
JTAG in Zyxel 660HW
Last edited by AlWise on Tue Jan 30, 2007 4:33 pm, edited 3 times in total.
I think you mean JTAG, see discussion in other threads for more info and further links
viewtopic.php?t=858
viewtopic.php?t=827
viewtopic.php?t=858
viewtopic.php?t=827
Last edited by mstombs on Tue Jan 30, 2007 3:54 pm, edited 1 time in total.
On my Zyxel there is space to solder a 14-pin header on the underside of the board, labeled JP3. (See attatched photo, slap bang in the middle!)
Could this be the JTAG header?
Leo
Could this be the JTAG header?
Leo
- Attachments
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- zyxel660_bottom.JPG
- Photo of the bottom (solder) side of a Zyxel 660 router.
- (465.01 KiB) Downloaded 334 times
Sure looks like it, should be able to check with a sharp pointed multimeter that pins 2,4,6,8,10,12 are all connected to 0V, pin 14 to +3.3V.Leo wrote:On my Zyxel there is space to solder a 14-pin header on the underside of the board, labeled JP3. (See attatched photo, slap bang in the middle!)
Could this be the JTAG header?
Leo
Are these surface mount pads only? On the ADSL2MUE the header has 'through hole' connections and everything easily accessible on edge of board.
Soldering in the middle of the board like that would really be a last resort!
NB if you are only doing as a one off I'd recommend soldering very thin bits of insulated wire straight onto the pads and not bother with permanent header - just cut them off when problem solved.