Were you trying to wipe the cache in the recovery mode?
Or wipe the cache for a specific app in the 'Settings' > 'Device' >'App'.
And is your NEO U9-H able to start up?
I saw it happened when you enter into the recovery mode, but will it happen when you press the power button to boot up the device?
I ran into this problem before when I try to enter the recovery mode, but when I boot up the device, it went well.
it happens when i try to wipe the cache partition. The box starts fine. My box is running pretty slow and i think the partition isnt getting wiped due to this error. when running kodi it takes a long time for addons (legal) to load.
Seem to be an hardware problem.
But I'm still cling to a hope that a manual re-installation would somehow fix it.
If not, please send an e-mail to support@minix.com.hk, we will take care of it.