Should work with HONG KONG.

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XS++ 3.1 Guide-Flashing,Customizing,Recovering - Top Sony Forums

You don't need to flash since you have a mobile which flash themes already work on. You will need to download flash themes.

-Back up GDFS just in case.
-Scroll to number 5 and follow that
-Flash themes go into
;Flash Menus -> 'TPA/PRESET/SYSTEM/DESKTOP/FLASH'.