It can be any version. My service provider told me to use this version but I couldn’t find it on the internet
Ok, so I had feedback from ASUS this morning and they have checked internally and with all there distribution partners and are not aware of any such versions being released by ASUS.
They have asked, if any issues with IPv6 then send feedback form and detail ‘UK Sentinel’ at top of comments box and they will look into issue as a matter of priority 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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