@sergeyvl12: newer devices (Clara, Forma and KoboH2O2, aura too¿?) use a mixer instead of separate G/R leds. On KOReader this is only implemented for the Forma
https://github.com/NiLuJe/koreader/c...50b86ccd95e2d4, as you can see the interface is easier and the results are closer to stock.
More info here:
https://github.com/koreader/koreader...ment-439700537