Don't use a legacy "stable" KOReader version, either use a new "stable" from GitHub (i.e., the monthly nightlies from the Releases section), or a "bleeding-edge" OTA.
Underlying FW version has no impact on KOReader (... provided it's run via KUAL and not kpvbooklet), so I guess the usual answer of "the latest FW 5.8.x" still holds. (With the caveat of 5.9.x being a possible choice if you want the custom font feature, if that even applies to the KV).
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