Downgrading 5200 wireless controller from delivered code 10.11.03.004 to site code 09.21.11.0004

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My cleints have attempted to down grade a 5200 unit to verion 09.21.11.004 from the supplied version of 10.11.03.0004 ( this is so it matches the current operational box ) 

The downgrade has failed with the following prompt:
Error! Upgrade is not supported from major release :10

I would like to know how can I can downgrade the unit to the required software level 
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Rod Robertson

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Posted 1 year ago

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Ronald Dvorak, Embassador

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Downgrade isn't supported instead you load a rescue image with another/older firmware.

If you don't have a 9.21 resuce image from another C5210 you should contact the GTAC.
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Hawkins, Bruce, Employee

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You will have to get a rescue image for 9.21 and either FTP it to the controller or put the uncompressed image on a flash drive and attach it to the controller.  Once you have the rescue image on the controller you can then click "Upgrade Now" which will use the 9.21 rescue image to back rev to 9.21.05 (which is the version supplied in the KCS article I will provide at the end of this).  At that point you should upgrade to 9.21.18.

https://extremenetworks2com.sharepoint.com/sites/kcs/Internal/000001249/5210-rue-09.21.05.0007-rescu...
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Rod Robertson

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Sorry I cannot access the https link , do you have another as this keeps directing me to my internal 365 account.
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Jason, Employee

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Rod, I uploaded that file to a different link and you should have received an email.  

What Ron mentions below is also a good method! 

Regards, 
Jason
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Ronald Dvorak, Embassador

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I'd do the following...

- put a flash in the current controller
- upgrade to 9.21.18 and select backup image to flash
- remove the flash and put it into the new one
- don't connect the new one to the network yet
- upgrade to the flash image
- upgrade to 9.12.18
- change the parameters
- connect to the network
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Rod Robertson

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Many Thanks  everyone.

Rod