Here is a copy of MTCB-KLD6-V2.86. (thx to macca017 )
https://mega.nz/#!FwpwARAa!W966JLtWiwrUen7aAbqq0Goo-7uGWBP_G3Qv2MbhMWU
But i think the Problem is not the version you have installed. Have you made the right tuner settings in Factory Settings? When you make a upgrade/downgrade of your
mcu...