Upgrade procedure from 11.5.0 TO 11.6.0 In active/standbye mode

why i shall re-activate f5 boxes , if manual reactivate is working or shall be automatic ?

either is okay.

sol7727: License activation may be required prior to software upgrade for the BIG-IP or Enterprise Manager system

i noticed that also 11.6 image is same image for devices is that right

what do you mean?