ap automatically downgrading

[ARABINDA_MOHANT]

Hi

We are trying to upgrade 3805i Access Point from 9.15.x to 9.21.x , AP GETS UPGRADED to 9.21.x BUT Immediately degrades to 9.15.x automatically.

[Sai_Prasad_Rao_]

Great !!

It worked for you ...... 

[ARABINDA_MOHANT]

According to your suggestion i replaced one ap and automatically it upgraded to my firmware...
now it working fine.......

[Umut_Aydin]

Let assume the upgrade worked before..then the solely posibility that the AP revert his code back is
if he resets 3 times . In this case the AP will take his 2nd image / backup image.
If you upgrade the AP twice then yo will have the same code as your primary code and for your secondary / backup code.
In this situation it shouldn't back after a reset.
FYI.

But till get this approved it's the best you try it wit controlled upgarde.
If your AP are behing Cloud/Internet/VPN reduce the MTU size to 1400.
Maybe tftp(upgrade) is maybe forbidden or the MTU size was to big?!

Good luck

Umut

[Ronald_Dvorak]

Let's do it step by step....

1) in the controller GUI go to > wireless APs > Global Settings > AP maintenance > is the upgrade bevahior set to ...
a) Upgrade when AP connects using settings from Controlled Upgrade
OR
b) Always upgrade AP to default image

2) go to > Controller > Logs >set "Wireless Controller Log Level:" AND "Wireless AP Log Level:" to informational

3) try again to upgrade the AP and after the whole process go to > Logs > Severity: All
copy/paste the result here or take a screenshot to post