Please confirm the Roku OS version number installed. You can find it under Settings/System/About. The Roku support staff might also want the serial number, which is listed on the same page. Also, exactly which model Ultra do you have? The model number, please.
I have three different versions of the Ultra, and all are working fine. Just need to troubleshoot some things with you. Exactly what do you mean by you can't use any channel? Will they not load? Will they load but not work once loaded? Can you browse titles, but they simply won't play? I know you said "any channel", but could you list at least some of the channels you've tried to use?
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I am having the exact same issue. System updated maybe 3 days ago now only Netflix will stream video, all other apps claim a network connection issue. I have tried all troubleshooting option rebooting Roku ultra and router, reinstalled apps, swapped Roku ultra with working Roku (different model) on another TV to no avail. Update is definitely the cause of the issue.
After a software update a couple of days ago none of the channel apps on my Roku Ultra are working except Netflix. Other than Netflix the apps, Hulu, HBOmax, Showtime, Starz, Prime, etc. all say there is a network connection problem. I did all the troubleshooting, rebooting device and router, reinstalled apps, changed networks, changed network channels, I even moved the Roku Ultra to another TV where there was a working Roku and swapped devices and still the Roku Ultra could not stream video on the apps. This problem is clearly because of the update because my Wi-Fi network is working fine, Netflix can still connect, and my other Roku is working fine with all apps
I can now confirm (as several others already have), that about 4 hours after my PM (Private Message) to Roku-Danny-R, I got a private response to re-check my Rokus > System > Update for a (Rollback) update waiting. As soon as the 10.0 build 4209 (Rollback) update re-installed and rebooted all else was immediately good and speedy! Also some of the other channel app error messages went away as well such as DRM Errors, or No Network Connection Detected or Available (even though the OS 10.5 did show a good hardline ethernet at 93 Mbs). So it seems at least some of the issue(s) involved unlocking and/or sharing the Network, RAM, and other Resources instead of blocking them (accidentally or intentionally due to DRM Digital Rights Management issues).
BTW, (By The way), if you don't see the Envelope Icon in the Upper Right at the Top of the Forum Page between the Bell Icon and your Forum Avatar Icon then you may have to use (View) enough of the community pages to Raise your Forum Avatars Level to get that icon to appear, That is what you click to View Private Messages, then click New Message to compose a new one.