Due to local customs being closed for the holidays, shipping will resume on October 6th.

Below is the tutorial showing how to check your keyboard firmware version on your Mac.

Step 1: Click the Apple icon and select the "About This Mac" section.

Step 2: Click the "System Report" section.

Step 3: Click the "USB" section first and then select your keyboard model in "USB Device Tree", you will find out the firmware version of your keyboard model. 

Note: Please check your keyboard firmware version before you use firmware to update your keyboard. The keyboard firmware version should be the same as the firmware version you use.