OS NX5 with AX-mainboard
This OS is only for Nautiz X5 units with the new mainboard AX type.
You can find the OS for the old maindboard version KB3720.
To see how you can determain what mainboard version look at the s/n of your device. The fifth and sixth character in the serial number tells you about the mainboard version. If the fifth digit is X you have a X mainboard if fifth and sixth is A and X you have a AX mainboard.
If you reload wrong OS on your units your mainboard will crash.
The downloads below are all for the same OS version but for different hardware configurations. Pick the one for your device by looking at your S/N. For example "AX4" is for a serial number starting with "I600AX4...".
You can find a guide on how to install the OS KB3784.