BNA, I suggest you to repack update.zip as more safety way to update device (boot and recovery in EE seems different from other android devices, so you need to be carefull, but update.zip look safely (at least unless you scewup uboot). boot.zip --> zImage is a kernell which need to be updated. Systems.zip (1,2) contain both android framework, propriatetive drivers and eink software.., so you'll need to merge it to enable eink and wifi.