I just did the final Forge steps on a Pi4 (4GB) (optifine and mc already installed) Forge does not load, but above that it should work (since optifine does, at least, run) you have to edit (ie : replace 5.2838 with 4.2713) the forge run script, it is made for 5.2838 but the tutorial says to install...

unless the room temp is at 50° or your pi is locked by never_over_voltage, you shouldnt lower the idle frequency. no harm will be done if you do so but its pointless as the pi doesnt automatically lower the cpu voltage under 600mhz. i once tested the voltages at different frequencies : (rpi 3b+) the...