For what it may be worth, I installed OCP-Plato-0.9.44_KOReader-v2025.04.zip on a Kobo colour device with firmware 4.42.23296. I then ran the KFMon uninstaller and updated NickelMenu to the last development version. After this, I added the lines to run Plato and KOReader to the NickelMenu config file. Lastly, I unpacked koreader-kobo-v2025.04-125-gf2c678c20_2025-06-19.zip (the latest nightly just before I wrote this message) over the contents of the koreader directory in .adds. Launching from NickelMenu, both Plato and KOReader opened with KOReader telling me books would be rendered in colour.
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