It hang a few times if I pressed too fast. 1G/16G a lot of difference 

btw! I rip Ubox appmarket and installed into my Himedia H8+. that's a few of the apk can be used and LETV TV apk works well, It has 4K movies section that is usable. 

You need to install ES explorer. from there go to local>library>app. choose the apps you wanted to ripped out the apk. Long press the icon and select backup. Monitor which folder the apk going to save into. Go to that folder to save out the APK.

Enjoy!

btw! the ubox appmarket app are very choosy. Some not able to install the app into other TV boxes. So far I only able to get it work with my Himedia H8+. even the LETV tvbox version can only work if installed from the appmarket or else it only works for 1 day with other TV boxes.

All the apps I installed from Ubox appmarket worked for me until today.