km8 android box 17.1 update not installing

Hi,
Have a km8 amalogic s912 64 bit octa core arm cortex 2g/16g with 6.0 marshmellow and 17.0 krypton.
Had a couple boxes before.
I see linux and android mentioned.
Tried a couple of kodi 17.1 android 64 bit downloads but no success.
Never successfully.
Any ideas?
Thanks in advance.
Dave