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I'm not 100% sure, as the ax4200 was added as a child node to a non CF router, but from what I have read:
I believe you can't use it as a router unless your ISP is CF, also you can't update the firmware if you're not at CF customer
So firmware updates were my main reason. Also because I've got a broken ankle and I'm bored AF
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Having been playing around virtually all day with sodding CF routers (replaced non CF parent node, mr7340, with retail flashed mx4200, got two mesh routers connected, but 2 other mx4200s wouldn't), I think that there is a limit within the firmware with regards extending your network.
The two mx4200s that would connect, then cycle through flashing red, solid blue, flashing blue and infinitum, were on the CF firmware. I flashed one with the starhub firmware, then the retail, and it connected as a child node and stayed connected. I could then add the single remaining CF firmware mx4200 as another child node and it worked straight away. I'll flash that one at some point too.
If anyone has one of the Linksys AX4200 routers, you can downgrade the firmware, then install the Linksys retail one if you are so inclined.
I've just tested it on a cheap one I bought from eBay:
https://www.reddit.com/r/LinksysVelop/comments/10fyy2h/unlocked_communityfibre_mx4200/
Goto x.x.x.x/fwupdate.html (x.x.x.x is your ip address)
Download the Starhub router firmware - https://www.linksys.com/support-article?articleNum=317331
Attach the update, press upload and wait until it says OK
Download latest retail (non starhub) fw from linksys for mx4200
Attach the fw and spam upload for a few seconds, if done correctly it should say OK