Azure Sphere version 20.09 is now available
Published Sep 28 2020 02:35 PM 1,927 Views
Steel Contributor

The Azure Sphere 20.09 OS quality release is now available in the Retail feed. This update includes the following enhancements and bug fixes in the Azure Sphere OS; it does not include an updated SDK.


  • Upgraded Linux Kernel to 5.4.59. 
  • Closed off 3 potential areas of vulnerability as part of ongoing security enhancements.  
  • Fixed a bug that caused devices with duplicate trusted key store (TKS) images installed in the firmware partition to reboot after a software update. 
  • Fixed a bug that caused memory leak in libcurl. 
  • Fixed a bug that caused random failures to reconnect to IoT hub. 
  • Added new endpoint for HTTPS over TCP protocols to the documentation on networking requirements 
  • Fixed a bug that caused a SPI read/write larger than 2K to fail.  
  • Reduced default TCP socket buffer size, and allowed users to set the buffer size to a value greater than 11K. 
  • Fixed bug with parameter validation in file system quota checking.
  • Fixed block initialization bug during flash file truncation.
  • Changed validation of Azure Sphere-specific kernel capabilities to occur in the same manner as Linux kernel capabilities. 


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:
‎Oct 14 2020 12:33 PM
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