The charging circuit for Makita 18V batteries is a dedicated IC (typically a TI BQ series). It has internal mask ROM. No update exists.
: Once the update is complete, safely eject the USB drive from the DMR112.
Makita DMR112 radio features a dedicated Micro USB port located inside the battery compartment for software upgrades , there is currently no publicly available software update download for users to install themselves
: The dedicated micro USB port for upgrades is separate from the standard USB charging port and is found within the battery housing.