hmm i just read your post again....

'no echo' has NOTHING to do with the ecm.

the echo comes from your serial interface due to the RX and TX lines being tied together

you might have a...

go in this thread: http://www.gearhead-efi.com/Fuel-Injection/showthread.php?1160-64K-bootable-image-for-95-LT1-PCM

find the bins posted by 96lt4c4 a few posts down

that's what i used to flash...

the sockets are super bitchy. you can't solder them flush without snipping their bases out, then you either need to glue the bases back in or put a shim under them

as far as the image goes, one...