um… it’s a software eq… firmware probably isn’t going to fix it,
If you use vdj pro the eq is terrible anyway but if you use pc you can install “minimal systems instruments – ultimate 3 band” vst, it destroys anything else in sound quality, but you need to disable it when you are scratching if you have a slower computer. I do it with mapping the jog touch sensor with this, it shuts off the effect when you touch the platter when vinyl mode is active.
vinyl_mode 1 ? down ? effect "ultimate 3 band" active off & touchwheel_touch 1 : touchwheel_touch 0 & effect "ultimate 3 band" active on : touchwheel_touch