Here You can find very good tutorial how to resurrect bricked Netgear router WGT264 without using a jtag cable :
http://www.embraceit.com.au/wgt624/
There are some interesting steps in this tutorial. First is the step 4 were the trendnet firmware is stripped or converted from .img format to .elf file.
“… Step 4.
The TRENDnet firmware needs to converted from its .img format to the .elf format so that the file is bootable over TFTP. I used http://www.cygwin.com and the following Linux command to strip the superfluous header information :-
dd if=510APB_1121US.img of=510APB_1121US.elf skip=52 bs=1
…”
Second interesting thing is that the author is used AP firmware to reflash router. May be will be possable to reflash a router and use different wireless modes like AP client or WDS ?