Kobo is quite friendly with 3rd party software. Both Plato (in rust) and KO-Reader (in c/lua) are excellent alternative to builtin reader app, the only drawback

Kobo is quite friendly with 3rd party software. Both Plato (in rust) and KO-Reader (in c/lua) are excellent alternative to builtin reader app, the only drawback is they can't open DRM-protected books. https://github.com/baskerville/plato https://github.com/baskerville/plato https://github.com/koreader https://github.com/koreader