keyboard not working with keymander

What keyboard are you using? Does it have two USB connectors on the cable or have a built-in USB hub or audio card? If so you'll see a headset port and/or USB ports on the keyboard.

Generally speaking, if the K2 shuts down or starts a power loop when the keyboard is connected, it means the total of keyboard, mouse, and controller are drawing too much power. This can happen due to certain keyboards or a controller that is trying to charge and pulling too much current (usually due to older built-in batteries in PS4 controllers). These situations are usually resolved by adding a 2A or greater USB power supply to the K2 power port.