Just as an update, I have had feedback from ASUS and indeed the SSH option for (DSL-AC68U_9.0.0.4_386_39469-g444fdb5_DSL_1.0.5.1.trx.zip ) does does not work.
Will be fixed in next official release 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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