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This paper improvies the traditional FOTA system to a more robust one named ANFUOTA. This technique is only applicable to systems without embedded operating systems and to microcontrollers without multiple flash memory bank. This novel system is capable of updating the firmware in an asynchronous mode via networks WSN/WSAN kind and furthermore, it guarantees that the system never be without a valid firmware or rather, it is immune of communication failure or loss of packets and even feeding loss, independently of the updating phase. Even during the memory rewriting, in case it happens a feeding failure, the system will begin all over again the recording in the next rebooting. The used technique foresses an updating via networks WSN kind in an asynchronous mode and the firmware can be received in a distributed way in time and in many pieces or capable of being continuous. During this phase, the system remains online and doesn't enter in recording mode, keeping its activity on network. The system guarantees immunity in face of feeding loss and loss of packets by the network in all phases of updating, enabling updating all devices in network, simultaneously.