I bought an X10-4G in order to implement "hybrid mesh backup" as described here:

https://www.tp-link.com/uk/support/faq/4251/

Unfortunately it does not work as planned.  If I add the X10 to me Deco netweork as a satellite Deco (which is what I need, because the wired connection is about as far away as can be from the location the X10 needs to be in to get a good 4G signal), then go to "Advanced", there is no "Internet backup" option.

I suspect this is becasue my main Dco is an M4R.  I suspect that this doesn't support internet backup.

The FAQ helpfully point out that  "Features may vary from different Deco models." - I'm thinking that the relevant feature is missing from my M4R.

So I think that what I need to do is to replace the M4R with another Deco which does support internet backup.  But, before I spend more money on this project, I want to be sure that it will work.

So, my question is, which Deco models will support "hybrid mesh backup" using my X10-4G?

I can't find an answer to this anywhere on the TP-Link site.  The nearest is a post that says that X50/X55 support hybrid backup.  Can amyone confirm that these will work with my X10 ?  If so I will invest in one.

Thanks for any help you can give.