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XBee HPX 900 Release Notes
=============================
### XBee HPX 900
### Version 800000 - (May 11, 2026)

---

INTRODUCTION
------------
These release notes document changes made to the DigiMesh firmware on the
XBee XR TH 900 modules.<br>

* [Product Information](Product information page coming soon)
* [Documentation](https://www.digi.com/support/productdetail?pid=5639&type=documentation)
* [Support](https://www.digi.com/support/productdetail?pid=5639)


<br>SUPPORTED PRODUCTS
----------------------
* XBee-HPX 900 - XBee HPX 900 MHz radio module
    * Through Hole (TH)


<br>KNOWN ISSUES
----------------
1. The Diagnostic counts for transmissions (**EA** and **TR**) are not always as
   expected because sometimes there is an extra network retry. *[XBHAWKDM-200]*

2. The **FT** flow control threshold may not be calculating number of bytes
   properly. If **FT** is set to too low of a value (less than 0x20), CTS will
   assert indefinitely. *[XBHAWKDM-611]*

3. Duplicate packets can occur if streaming unicast data across multiple
   synchronous sleep cycles. *[XBHAWKDM-739]*

4. Following a low-voltage reset, initial Digimesh network packets might be rejected
   as duplicate packets. *[XB3LRPRO-265]*


<br>UPDATE CONSIDERATIONS
-------------------------
XCTU (XBee Configuration and Test Utility) is recommended for updating the
firmware of your radio module to the latest firmware version:
[www.digi.com/xctu](http://www.digi.com/xctu)<br>

<br>The following files are included in XBee XR 900HP firmware releases:

* Firmware
    * .gbl:  Firmware image for OTA/serial updates. This image
             will also upload the bootloader if the included version is newer
             than what is currently installed on the device. It is recommended
             to use this file for most updates.
    * .apponly.gbl: Firmware image for serial updates, excluding bootloader
                    updates. This image contains the firmware, but no bootloader
                    upgrade data. This image may be used when a bootloader
                    upgrade is not desired. Note that it is not recommended to
                    use any firmware image with a bootloader version older than
                    what the image was released with.

* Configuration
    * MXI:  Legacy X-CTU configuration file
    * XML:  XCTU-NG configuration file


<br>UPDATE BEST PRACTICES
-------------------------
Digi recommends the following best practices:

1. Test the new release in a controlled environment with your application before
   you update production devices.
2. Unless otherwise noted, apply updates in the following order:
    1. Device firmware
    2. Modem firmware
    3. Configuration
    4. Application

Digi recommends Digi Remote Manager for automated device updates. For more
information, go to [https://www.digi.com/products/iot-platform/digi-remote-manager](https://www.digi.com/products/iot-platform/digi-remote-manager).<br/>
If you prefer manually updating one device at a time, follow these steps:

<br>**Serial firmware updates:**<br>
Invoke the bootloader using one of two methods:

#TODO: Update links below with links to XR documentation

* Issue the **%P** AT Command
* [Using hardware flow control lines](https://www.digi.com/resources/documentation/digidocs/90002277/Default.htm#concepts/c_xbee_bootloader.htm)

<br>Interface with the bootloader at 115200 baud and transfer a bootloader or
firmware image as per the [user guide](https://www.digi.com/resources/documentation/digidocs/90002277/Default.htm#tasks/t_send_image.htm).

<br>*An [XBee MultiProgrammer](https://www.digi.com/resources/documentation/digidocs/90002277/Default.htm#concepts/c_multiprogrammer.htm)
is available for serial firmware updates in a production environment.*

<br/>*The [XBee Network Assistant](https://www.digi.com/resources/documentation/digidocs/90002277/Default.htm#concepts/c_nwk_assistant.htm)
can be used to manage your network and optimize it's configuration prior to performing an OTA update.*

<br>TECHNICAL SUPPORT
-----------------
Get the help you need via our Technical Support team and online resources. Digi
offers multiple support levels and professional services to meet your needs. All
Digi customers have access to product documentation. firmware, drivers,
knowledge base and peer-to-peer support forums.

Visit us at [https://www.digi.com/support](https://www.digi.com/support) to find
out more.

---

CHANGE LOG
==========
800000 - XBee HPX 900 (May 11, 2026)
-------------------------------
* This is the initial release
* Bootloader version: 1.11.9
* Hardware revision A

### NEW FEATURES ###

* N/A

### ENHANCEMENTS ###

* N/A

### SECURITY FIXES ###

* N/A

### BUG FIXES ###

* N/A

---

*Release Notes Part Number: 93001389*
