There is a fun bug with version 18.104.22.168 ... (or its me?.. :cathappy: )
In version 22.214.171.124, it was possible to update Hypervisor via PRISM UI (with version 5.5u2), but in version 126.96.36.199, 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 188.8.131.52 and it should work.
Hope it helps.