I can't help you with the error, but you should report any error messages/codes to Max as it's their error and only they know what it means.
You can't remove a channel/app if you're subscribed through Roku. This is for your protection. Too many people removed a channel thinking their subscription would be canceled automatically and then were shocked when they noticed months later that they were still being charged. If you really want to try the remove/reboot/re-add method, cancel your Roku subscription. You will still have access until the end of its current period even if you cancel it. If you do try that, I'd recommend subscribing directly with Max to avoid this problem in the future.
One last note: make sure you check for updates under Settings->System->Software update and/or by highlighting the channel/app and pressing * on your remote to see if there's an option. Updates should happen automatically, but it doesn't hurt to check manually.
I am subscribed directly through Max. I should be able to remove/add/reboot any channel regardless. I can remove/add/reboot EVERY OTHER CHANNEL on my Roku EXCEPT Max.
