The NG line of the LoadMaster and ECS Connection Manager hardware appliances (released in 2023) use the UEFI boot method. Previous hardware models used the BIOS boot method. What this means for you is that you will only be able to update hardware with new firmware using update images that support the boot method used by the hardware being updated. See the table below for the restrictions.

7.2.54.4 and earlier 7.2.54.6 7.2.55.x to 7.2.59.1 7.2.59.2 and later
NG hardware (2023/2024) N Y N Y
Previous hardware models Y Y Y Y