A little update about what I found out. I've dismantle phone kit completely, including phone cradle, a device from underneeth the central console, where all wires were conected to, speaker, aerial lead, and mic. I haven't take off the devices I have pictured earlier, those from the boot. I don't know what r they for, I guess that's what left from original phone kit cos the one I just striped was a amateur job and not original, just an old style Nokia set.
Radio start finally giving some sound, after few mins of playing but is still quiet, not what U can expect from premium sound system, definetely is not muted anymore just playing quietly.
I took off the amp and find out that it was all wet and very dirty inside. Amazing that it was still working at all. I'm drying it now to see if that helps. I had a look inside and can't see any burned things in it so I'm hoping to be fine.