This article describes how to upgrade wan edge SRX from mist. 

Note: Please take all necessary logs, RSI etc before the upgrade process as mist would initiate storage clean up once upgrade is triggered. 

• Open Wan Edges > Select the Site > Open the device you wish to upgrade 
• Click on Utilities > Select 'Upgrade Firmware' 
• This will open a new dialogue box from where you can select the version:

• Select the version you intend to upgrade ( Note : The suggested version in this page and the suggested version for SRX in KB21476 [juniper.net] may differ, as the version shown here are tested and qualified by Mist QA team for all mist related features. ) 
• Once version is selected Click 'I accept the end user license agreement' , You may select reboot the device after upgrade as well so that upgrade happens automatically, else you can choose to just add the version now and reboot later. ( Note : If upgrading cluster reboot option would be selected by default ) 

• You can see the upgrade progress in the status bar or can be seen in wan edges page as well. 
• You can see more information on upgrade progress in wan edge insights page. 
• Once the software is added and if you have not opted for 'Reboot device after upgrade' you would see the below status on your wan edge:

• You may reboot the device once ready from Utilities >> Reboot wan edge or click on Pop up in top of page "Reboot Wan Edge"
• If Console is available do monitor the device reboot process for any errors. ( it is always advisable to have a console of the device ) 
• Once the device comes up, it would auto connect to mist and you may see the below Events in the insights:

• The upgrade is successfully completed, please cross check the device for any alarms, core-dumps, CPU spikes or flow session etc from the remote shell. Few commands are given below. 

show chassis routing-engine 

show system alarms 

show system core-dumps 

show security flow session summary 

Feel free to contact JTAC if you face any issues.