please help me ... i lost my serial number in my mac book pro mid 2011 , then i can't login to itunes and app store ... can u help me please
By serial number, do you mean password; If so read this document and follow the instructions.
my serial number "unavailable"
I hate to use a Google service for a question but there appear to be multiple reasons and you might find an answer here.
Google ... Apple serial number unavailable; there are several answers.
I didn't consider what your screenshot shows ... and I still can't fathom what this has to do with logging in to App store / iTunes.
seventy one , if the serial number is unavailable i can't login to appstore .. and other in my mac book pro ... so can u help me to fix the serial number bring back again ?
I wish I could but I do not have ElCapitan. I misunderstood your original request as my first answer shows. Now and then people mis-describe their problems, though you clearly didn't. Did you read the google question I used
.... Apple serial number unavailable? Most of the answers relate to MacBook Pro.
There is apparently a "utility app" available at the Apple Retail Store tech bench and to Apple Authorized Service Providers that can fix this (historically associated with some sort of hardware replacement)
Genius Bar - Apple Store - Apple < choose "Get help now" link
Apple - Find Locations < choose the "Service" Big Button
serial number unavailable after update El capitan 10.11.1
