ePMP 1000 non gps firmware upgrade

I trying to upgrade a ePMP 1000 2.4ghz SM. It was bought new on 10/5/20 with the firmware of
U-Boot 9344_PX 1.1.4.a (May 14 2014 - 21:08:49)
I have tried the latest firmware but I get errors and will not let me upgrade. Is there a particular way to upgrade the firmware in these radios?

2.0 -> 2.3.4 -> 4.4.3

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