I second that!
After hours of unsuccessful attempts to flash the BenF firmware last night I quickly came to realise my new Amazon purchase is running the 3.26d boot loader. 
One thing I have noticed is the stock firmware for this unit is a single HEX file and not two separate LIB and APP HEX files as is the case with all the available versions of BenF’s firmware.
I did try copying both HEX files into one file and applying that but it didn’t make any difference.
Maybe the firmware just needs to be recompiled into a single file like the stock firmware is?