RCS DigiTV(TV1000 @ 1W etc) & Diablo/Underworld (170 in fact any UnderWorld since 151) Question?

Turn N2 AU [OFF] its not been fixed on Underworld yet. And then either enter the new key from the keys section or as dimitri says load latest key bin (or use Fausto or Diablo Key Edit tools to edit your own key.bin).

All RCS DigiTV including TV1000 still working fine

If you mean the TV1000 which is part of the RCS DigiTV package, then no problems here.

Turn N2 AU [OFF] and enter correct keys from keys section or load one of the updated key.bins

and enter correct key from keys section or download one of the updated key.bins and use cas interface to upload it to diablo in same way as you would a data.bin file

Exactly the same as it has been since RCS's key change on 31/12/08 with UnderWorld151 and all UnderWorld releases since ie 152 to 170 etc. I suspect N2 AU wont be fixed now as RCS Digi are simulcasting in Nagra3, new Nagra3 cards are being issued so RCS Digi will switch to Nagra3 only sometime later this year

DigiTV work fine....... have you remembered N2 AU [OFF] in CAM settings and updated key.bin as you did with previous Underworld.....?

Working fine here - you updated the keys / key.bin also?