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12 Firmware and OTA Updates
This section documents how to enable firmware updates in the design, whether it is serial or Over The Air (OTA)
12.4 Device Firmware Upgrade Over Zigbee Link
12.4.5 Zigbee OTAU - Image Distribution Procedure

Introduction
1 Getting Started with WBZ451 Curiosity Board
This section covers the evaluation board features and running the preprogrammed demo example.
2 Getting Started with Software Development
This section gives a detailed information on the steps to install IDE, compiler, tool chain, BLE, Zigbee stacks and application examples on the PC.
3 Getting Started with Bluetooth Low Energy Applications
This section provides details on documentation describing the steps to test and develop the precompiled BLE application examples.
4 Getting Started with Zigbee Applications
5 Getting Started with Multiprotocol Applications
This section describes steps to test and develop the precompiled BLE and Zigbee coexistence application examples.
6 Getting Started with IEEE 802.15.4 P2P Phy Application
7 Getting Started with IEEE 802.15.4 MAC Applications
8 Getting Started with Thread Applications
9 Adding Chip Peripherals
This section describes how to add analog/digital peripherals to the application
10 Flashing hex from MPLAB DISCOVER using MPLAB IPE
This section provides a detailed procedure of how to download an already existing application hex file from MPLAB DISCOVER and flash the hex file into WBZ451 Curiosity Board using MPLAB IPE.
11 Low Power Design
This section explains in detail on how to enable the low power modes – Sleep/Standby or Deep Sleep/Backup modes in the design.
12 Firmware and OTA Updates
This section documents how to enable firmware updates in the design, whether it is serial or Over The Air (OTA)
- 12.1 Bootloader
- 12.2 Device Firmware Upgrade Over Serial
- 12.3 Device Firmware Upgrade Over BLE
- 12.4 Device Firmware Upgrade Over Zigbee Link
- 12.5 Microchip Utility Tool
  Microchip Utility Tool is windows based GUI Tool used for firmware upgrade.
13 Wireless System Services API
14 Support Documentation
This section has documentation that is generic and used as supporting document with the application example documentation.
15 Software API Guide
16 Porting Guide
Microchip Information

12.4.5 Zigbee OTAU - Image Distribution Procedure

The Basic Networking for Image Transfer for zigbee node is shown in below figure.

Step 1: Encrypted and Signed Zigbee OTAU bin (.zigbee) File generation using signature and OTA configurator in MPLABX device properties. Copy the OTAU file to Zigbee OTAU PC tool to which zigbee OTAU server is connected.

Step 2: Transfer the OTAU Flash image over zigbee OTA service to OTAU Client node

Step 3: Image is decrypted using AES Key in Target and stored in Embedded Flash Slot1

Step 4: Once the complete image is received, the device is reset. Bootloader will copy new image from Slot1 to Slot0 after image authentication is done.