Debricking Linksys WRT610N v2

After updating the firmware, I could not get into the router via ssh. The Internet was working, though. I decided to do a factory reset.
After that, the router does not boot normally. Restore via management mode is not available. Through serial port I get unreadable characters. maybe it's the adapter. I am using HL-340.
the only available restore mode is via tftp. But the router does not flash the successfully sent firmware. I know about the 4mb limitation and use snapshot
How can I restore this router?

You need working serial connection.

HL-340 appears to be RS232 to USB adapter.
Are you using an additional RS-232 to TTL level convertor in between the HL-340 and your router?

If you have direct wired Tx, Rx and Gnd from the HL-340's 9 pin connector to the router, you may cause serious damage to the router's serial TTL interface !

I recall spec of RS-232 signals is 'upto' +/- 15 volts and the signal is also inverted. However, the HL-340 might only deliver +/- 5 volts because it is powered by USB.

You need to use a 3.3v serial-TTL USB adapter such as a PL-2303TA etc.

fyi, A good guide for recovering 'vintage' broadcom based Linksys routers such as WRT610n
In my experience, the NVRAM needs to be erased.

1 Like

I'm basing my advice on my experience with the wrt610n v1.
While that device has a push-button tftp recovery, it's misconfigured by the vendor (and has other quirks, which easily crash it), breaking that option - so serial console access is necessary, to load/ flash the image from CFE. Serial console access must be 3.3V, if your adapter gave it 5V or +/-15V (up to +/-25V allowed), you will have incurred permanent hardware damage.

Thanks for the answers. I was able to connect to the serial port using rpi.
As it turns out, my lan doesn't work. I set up a firewall to connect via wan.
How do I restore completely? I tried sysupgrade to the stock firmware, but nothing changed.

See if this helps to debrick your device

This topic was automatically closed 10 days after the last reply. New replies are no longer allowed.