Azure Sphere OS update 20.09 now available for compatibility testing
Published Sep 10 2020 05:00 PM 1,815 Views
Steel Contributor

The Azure Sphere OS quality update 20.09 is now available for evaluation in the Retail Eval feed. The retail evaluation period provides 14 days for backwards compatibility testing. During this time, please verify that your applications and devices operate properly with this release before it's deployed broadly via the Retail feed. The Retail feed will continue to deliver OS version 20.08 until we publish 20.09 in two weeks.  


The 20.09 release includes the following enhancements and bug fixes in the Azure Sphere OS. It does not include an updated SDK. 


  • Fixed a bug that caused devices with duplicate TKS images installed in the firmware partition to reboot after a software update.
  • Fixed a bug that caused random reconnect issues from IoT Hub.
  • Fixed a bug that caused memory leak in libcurl.
  • Fixed a bug that caused an SPI read/write over 2K to fail.
  • Reduced default TCP socket buffer size, and allowed users to set the buffer size to a value greater than 11K.
  • Linux Kernel upgrade to 5.4.59.


For more information on Azure Sphere OS feeds and setting up an evaluation device group, see Azure Sphere OS feeds. 


If you encounter problems 

For self-help technical inquiries, please visit Microsoft Q&A or Stack Overflow. If you require technical support and have a support plan, please submit a support ticket in Microsoft Azure Support or work with your Microsoft Technical Account Manager. If you would like to purchase a support plan, please explore the Azure support plans. 


Version history
Last update:
‎Sep 23 2020 10:36 AM
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