Firmware release notes for all Fortress products can be found here:
https://learn.fortresspower.com/external/manual/fw-release-notes?p=dc8b9a9c1b3f410556835193e66f2257b68c6e6de68e8e56e55d56a63ddc73de

If you are looking for firmware files or instructions, please go here:
https://www.fortresspower.com/firmware/