I've used ecuflash for a month and got some good experience until my last map. I'm not sure what mistake I did cuz I can't connect to the ECU anymore, the log said "(FFFF) unknown code" which I can't read and write to the ECU. Someone knows how to fix it? please help

Thx

PS 1. my car is Evo 9, JDM
2. evoscan is still working.
3. My program n cable can work with other evo.

 

Start the car and let it idle for a bit or drive it around for a while to get the battery voltage back up. If that doesn't work, download the ecu unlocker from aktivematrix.com