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Firmware of the week.
23.4.A.1.232 certified Sep 25, 2015.
https://www.ptcrb.com/vendor/complete/view_complete_request_guest.cfm?modelid=26395
So, what's within it?
Sony, please bring us the release notes/change list.
Same for the Z3 Dual!
https://www.ptcrb.com/vendor/complete/view_complete_request_guest.cfm?modelid=27777
It has been certified for all Z2 and Z3 family, and I don't think Sony will give changelogs for an update that didn't land yet.
Well, let's hope this update will fix the USSD code issue, otherwise I have 3 nice SONY devices that will land directly into my trash bin!!!!!
I hate it when they release an update and doesn't provide changelog.
23.4.A.1.200 was huge 1.5GB update and no one knows what changed. It is really annoying to be like a ignored and download what ever they release. Atleast they should give info about this one after it is released.
I am downloading it as I type...
23.4.A.1.200
I'll report later.
First thing I tested is the USSD and it does not work. No improvement here. 
Just to clarify: the firmaware just made available for my Hong Kong version is 23.4.A.1.200