Just seen this publication from ASUS, seems the DSL-AX82U EoL (end of life) is supported until 31th December 2025 at least for the UK.
Handy to know 
[Networking Product] Duration of Security Update Support (only for UK)
https://www.asus.com/uk/support/faq/1051929/
In a completely sane world, madness is the only freedom (J.G.Ballard).
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