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Open source router firmware project OpenWrt ships its own entirely repairable hardware
(www.theregister.com)
This is a most excellent place for technology news and articles.
I need this but 4G version..
GL.inet has some LTE routers with OpenWRT on them. I haven't tried the LTE version, and the one (Shadow) I have has to be rebooted once a week, but that's a really cheap one I was trying.