I am actually a customer of Optus - and would very much like to try this - to get it working.
However, I've got an 8707g. There is no version of 4.2 for the 8707g only for the 8700.
I had all sorts of problems trying to get the original 4.2 (in the sticky) to install on the 8707 (in the end it never worked, and so I reverted to 4.1).
Has anyone got 4.2 to work on a 8707?