@kawaiinekololis This method is intended for situations where mods have not been updated to the latest version. Since ViaFabric does not support compatibility between 1.20 mods and 1.21.1 mods, the only solution is to use an older game version. By doing so, you can also utilize ViaFabric to connect to 1.21.1 servers while using LiquidBounce and 1.20 mods seamlessly.
LiquidBounce Nextgen does not currently set themes permanently, as the client base is still being tested and modified and we can't be sure that the third-party themes are compatible enough not to break someone's client.
However, once we get past this point, it will be possible to set themes permanently.
most likely due to
java.io.FileNotFoundException: /storage/emulated/0/Android/data/net.kdt.pojavlaunch.firefly/files/.minecraft/mods/liquidbounce.jar (Permission denied)