First you have to compile frimware with this build option `NKRO_ENABLE` in `Makefile`.
Try `Magic`**N** command(`LShift+RShift+N` by default) when **NKRO** still doesn't work. You can use this command to toggle between **NKRO** and **6KRO** mode temporarily. In some situations **NKRO** doesn't work you need to switch to **6KRO** mode.
Try `Magic`**N** command(`LShift+RShift+N` by default) when **NKRO** still doesn't work. You can use this command to toggle between **NKRO** and **6KRO** mode temporarily. In some situations **NKRO** doesn't work you need to switch to **6KRO** mode, in particular when you are in BIOS.
If your firmeare built with `BOOTMAGIC_ENABLE` you need to turn its switch on by `BootMagic`**N** command(`Space+N` by default). This setting is stored in EEPROM and keeped over power cycles.