I just updated to 3.6.2 and it required additional power-cycle of DS to recognize bridge2 after upgrade.
Here are detailed steps i have followed in case PS Audio would like to follow-up on this:
Preparation: power off DS , wait 30 seconds, power up
In MControll i have triggered upgrade, waited few minutes so it finish up and reboot DS
After the reboot (which tool quite longer than usually) MControl and Roon have been able to see the bridge, however on DS display input for bridge was not shown. Tried to switch to bridge via remote but the screen was default bridge screen without showing anything being player, it have shown on empty nw settings (should be dhcp) etc - just like DS would not communicate with bridge
did additional power-cycle andthis time all works fine