I don’t recommend users to upgrade a G or H series APIM to MY18.5+ firmware, however, you can upgrade these to the latest firmware below. I you want to upgrade to the latest firmware, you may find the unit will “brick” and need to be restored. Below are links to the firmware versions and restore instructions.
APIM Firmware Production Releases - Ford / Information - CyanLabs Official Community
APIM Firmware Flash Rescue - Ford / Information - CyanLabs Official Community
This would be safe for the units.
3.0 APIM NAV & NON-NAV Unit Firmware (Production Release, 2017-Pre-2018.5, H thru Early J Series)
(Originally Found On 2017/Early 2018 Units That Ship with 2 USB Ports on Back)
Secondary Boot Loader: GB5T-14G376-AA
Strategy (F188): HB5T-14G374-CA
Calibration (F124): HB5T-14G375-DA or HB5T-14G375-FA (NAV) / HB5T-14G375-CA (NON-NAV)
ECU Configuration/Sound Profiles (F10A): GB5T-14G379-AA
ECU Configuration/Illumination Strategy (F16B): HB5T-14G379-BA
NOTE: This listing is representative of the production release files for North America. Use the Calibration File Region listing below to determine the proper -14G375- calibration file for your region.