The latest interface you should be using is the 12/14 JB4 Interface found here
The latest HEX file you should be using is: N55_ISOB.hex available here
There is a dropdown on the last tab [SETTINGS] - make sure you select option 7 in the menu for N55 135/335 ISO.
Also, verify on the [USER ADJUSTMENT] tab the interface version and the firmware version.
IF the interface and version are correct, then verify your work - and MAKE SURE YOU DISCONNECT THE NEGATIVE TERMINAL on your battery. 10mm socket needed.