Aaaaargh... Good ol Holden IQ updates !!!!!!
Yeah, at some point Holden reduced the amount of Bass adjustment that you can make with the Bass / Treble settings.
The reason being that people were blowing the stock factory speakers by pushing too much Bass through them.
(A very stupid reaction IMHO from Holden. There was nothing wrong with the Series I, and IQ systems before this update).
Instead of warning people about driving excessive sound through the factory speakers (and denying warranty claims for such things),
they decide to cripple the system for everyone !
(I know the factory speakers are shocking, but I personally would prefer to replace the speaker with a much better quality item if I accidentally blew the speaker, rather than cripple the head unit so as I never blow the POS speakers apart)...
The latest updates also cause a missing VIN error when retro fitting an IQ unit to a Series I.
(Turn the Ignition to off, and in around 30 seconds the radio stops working, with a missing VIN error message).
My 2c / end Rant Lol