razer raiju

hello in razer raiju, my L2 key is broken and it doesn't work. L1 key doesn't work either, I already assigned L1 key to M1 key, but L2 key doesn't work but I want to assign this key to M3 key, how can I do it? If the PC can be connected and the key can be assigned, I can access it from there, I would be very happy if you could help.