Hi Ben,
These are the steps broke down:
In Midi Control Center it says: Firmware Revision Unknown
When I click on Unknown a Firmware Upgrade window appears > Keylab 88 could not get firmware revision. It gives two options Upgrade / Cancel
I click on Upgrade and a window appears > Please select the firmware file to burn...I select KeyLab88-MP-v1.0.17-20150202.led
A window appears > Enter Firmware Upgrade Mode which says: Please unplug the keyboard, then plug it in again. Click 'OK' when ready, or 'Cancel' to abort the firmware update.
I follow the instructions and unplug keyboard, plug it back in and press OK.
A window appears Firmware Update Error Failed to open the device.
Any help with this will be gratefully received; I have had Keylab for weeks now and just want to get it working to play some music...