Hi I'm having skoda Octavia II 2007 model fitted with audience MP3 player n dsp sk35 1z0035456 I just want upgrade my HUD from audience to bolero but whenever I try to upgrade the player there's no sound in speakers cud any person tells me how can I upgrade the music system without changing the dsp

Do you have the "sound system" upgrade with 12 speakers. If you do ,I think you have to get one of the earliest models of the Bolero 08/09 maybe.

You can bypass the Amp by connecting the output of your HU directly to the speakers. The amp and the connectors are under the passenger seat.