I bought the Tiao adapter "lite" and followed this
page for jtag pinout settings.
http://www.tiaowiki.com/w/Debrick_Wireless_Router_Using_TUMPA_and_zJTAG
Download zjtag program and unzip in a folder.
From unzipped folder copy zjtag application to desktop.
Open "cmd" and navigate to desktop.
Type "zjtag" and press enter.
Commands must begin with zjtag -"command"
For the Linksys WRT350N the following worked.
probeonly:
zjtag -probeonly /cable:3 /L1:3 /noreset /nobreak /skipdetect
(please note cable:3 ids the cable and L1:3 is clock speed)
erase:nvram (brought the router back to life)
zjtag -erase:nvram /cable:3 /L1:3 /noreset /nobreak /skipdetect
Good luck!