To change firmware in your Gas ECU you should know what is the PCB version in your Gas ECU. To check PCB vesion you should see in the bottom of program screen. There is a full version number Example: ver. 1.5.17 - PCB version 5 - firmware version 17 For the example above you should choose firmware 1.5.x - whrere 'x' is firmware number for example 1.5.18
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