Thats why the option is there to use the sd card so that you can expand storage and use Kodi etc to its full benefit.
Why do you think we provided the option in ViX?
There is a simple option to format the card and also transfer the system so that you can get as much flash memory as you would ever need. It works and is painless!
Plugins like Flash expander and cache flush may have worked on the older receivers but not useful for the Arm/HiSi receivers.