Problem While Updating Software Samsung Galaxy Note 3

[AC Question]

I am facing problem when I click on Check Update it says Registering Device and then return with and error "Processing Error".

My Device is Samsung Galaxy Note 3
Model No. SM-N9005
Android Version: 4.4.2
Device Status: Official

One more confusion, i searched with my Note 3 Imei No, as displayed on phone and also by getting *#06#, Imei no is same but in search Model No was N900W8 Galaxy Note 3.
Now whats the difference between both model no.s

Waiting for some quick replies.

Thanks and Regards,
Faheem