To upgrade the OI firmware version:
copy the firmware file to a USB drive
insert it into one of the USB ports
navigate to the Config screen
press Maintenance
go to the Firmware Upgrade tab
press the Upgrade Firmware button
select the firmware file from the list of files on the USB stick
press "Select" on the file selection dialog - this will begin the firmware installation
OI-Windows screens do not have firmware upgrades. To upgrade OI-Windows runtime, simply copy the version wanted to the terminal. You may need to erase the previous copy of OI Win before copying over.