I get the "bad firmware header magic" error message when i try to upgrade T300 AP from 100.x to 104.x

[michael_brado]

It had exactly what you posted here above, and I removed it as Duplicate. 

I've created a ticket 834883 to RMA your faulty R500 model APs that won't download to 9.8.2.0.15.
TAC will be contacting you soon Mike.  Sorry you hit this issue, not many folks still on 9.8.2.

[mike_o_brien_dg]

thanks, but nope it wast, it had the title changed to reflect the R500 AP's plus a lot more detail, this one is about the T model.  I'm not trying to make your life difficult as you are the "official rep" here in the forums, but not the customer support people who left me hanging for three days to try figure it out myself.  But i'm sure you had input into getting them moving, as it wasn't long after both my posts that all of a sudden, i'm getting contacted, so I thank you for that. .