How to install MCU updates?

Find out the exact version of your current MCU on your System Information screen in Settings
Find if there are any updates available on Discord where everything apart from a date is the same
Extract the ZIP archive if necessary
Copy the ksw_mcu.bin file directly to the root of the FAT32 formatted USB drive
Plug in the USB drive into Head Unit (if you have two USB connectors, use the one without CarPlay label)
Go to Settings, System Information and select MCU upgrade

Android Head Units