Here goes.

found empeg unit: entering program mode
manufacturer=0089, product=88c1
waiting for prompt
starting erase [100%] erase ok
starting program at 0x10000 [Failed to get echo-back on lock/unlock command.

Error: lockpage(20000,1) got code 1

Press the Enter key to continue.

It programs to 100% then give this error. It does this with v300 or v269(latest one I have before 300). Using the latest file you posted(120420). Yes I know about having to rename it.