X1 Upgrade- Internet Required or Not

X1 boxes need Comcast Internet for all types of updating. 

And also for video on demand. It's also used for IP-only channels and most remote button keypresses.

However, many of the X1 boxes have a built-in modem and do not require a customer to have an Xfinity Internet account to access Xfinity-originated TV content: QAM and IP-only channels, DVR recordings (if part of one's plan), and video-on-demand. What will not be available are most of the apps since they access the Internet beyond the Xfinity network (no Netflix, no Disney+, etc.).

@Mark12547 

You forgot to tell us which Non-Comcast Internet you are using.

@Mark12547 @MNtundraRET Since we don't get the apps now on the legacy cable boxes, I would not expect them to be required in a no-charge upgrade which keeps existing functionality.

The "updating" remark concerns me, though.  Would the built-in modem support needed updates?

I am looking to keep Comcast Video-on-Demand without having to buy a subscription to Comcast Internet for my SD television.  (If no other reason, my email is kind of tied up with having another provider at this time.)

Thanks for any info/hints/warnings.

The "updating" remark concerns me, though.  Would the built-in modem support needed updates?

Yes.

@Mark12547 

You still have not answered my reply. I suspect you have Comcast, or Comcast approved equipment.