is there any option to reflash my ecu? because may ecu number is not match with your file
what is your recommendation? can i use other file?
my ecu number is 21175-1373. ninja 400
What year and region is your EX400?
That's a tough one to say since I don't want you flashing a wrong part number file in your ECU and having the bike not run anymore. You may be able to flash the EU -1377 file without issue but I cannot tell you for sure.
Best case would be to send us the ECU for prototyping and that way we can get the exact file for your ECU. We can get it done fast here the only timely part is how long it takes to ship here and then back to you.
thanks for the advice