Ehh pretty sure there was a thread on these forums where there was some “circumstances” that Cambium said the F300-16 had to have the same firmware in both banks.
Edit: It was you actually - ePMP GPS issues - #15 by Dmitry_Moiseev
Also , if that is true then why is “Upgrade both banks the same version of firmware” the step right after “send us the support file from the radio” ? Every single time I’ve worked with support making sure both banks are the same is always step #2 yet you claim “no need in any circumstances” to flash both banks to get things working ?