I got it in the end yeah, by the way that firmware you crossed out I suggest you uncross it, its the same as the version that shipped with my device KL4C0 which is a non beta release, seems odd you recommend a older beta over that version. But I guess you crossed it out as you didnt personally use it to verify stable for you?
The one and only firmware zyxel list (I agree is poor going) is older than what shipped with my router.