There is a fun bug with version 188.8.131.52 ... (or its me?.. :cathappy: )
In version 184.108.40.206, it was possible to update Hypervisor via PRISM UI (with version 5.5u2), but in version 220.127.116.11, its not possible :(see below)
Thks guys !
Best answer by DonnieBrasco
The reason for that is NOS version was released after that json file was created. You can edit the json file and add nos version 18.104.22.168 and it should work.
Hope it helps.