There is no official update to Android 6.0 (Marshmallow) for the Canaima tablet
Al instalar una ROM no oficial de Android 6.0 en tu Canaima: actualizar android 4.4.2 a 6.0 tablet canaima
Unless you are an advanced user willing to risk bricking the tablet, do not attempt this update . Instead, install Android 5.1 (Lollipop) via CyanogenMod 12.1 – it is more stable and faster on Canaima hardware. There is no official update to Android 6
the device and installing a custom recovery (like TWRP) to flash a new operating system. Community Support: adb backup -all -f backup