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Upgrade of IOS on AIR-SAP2602E-A-K9 = BRICKED!

exel
Level 1
Level 1

For some reason when we attempt to update the IOS of our AIR-SAP2602E-A-K9 AP's there's a decent chance that the unit will become unresponsive.   If you console to it, the device will be in rommon mode.  At this point we have to copy the image over via xmodem and then manually delete the old IOS image.  

Does anyone know why this happens or what I can do to stop it from happening?  

 

An example IOS version that we're wanting to upgrade is 15.2(4)JB3a going to 15.3(3)JAB.

It wouldn't be a huge deal if it wasn't for the fact that this happens maybe twice out of 10 attempts.  

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