Apple today released MacBook Pro Flash Storage Firmware Update 1.0 for the 2015 MacBook Pro, which fixes a storage firmware issue that could cause data corruption in rare cases.
Apple recommends that all customers who have a mid-2015 MacBook Pro download and install the update. It can be acquired from the Mac App Store on affected machines or directly from Apple's support site.
The mid-2015 MacBook Pro includes all 15-inch Retina MacBook Pro models that were released in May of this year. As MacRumors readers have pointed out, the 13-inch Retina MacBook Pro released in March is an "early-2015" model.
Top Rated Comments
You can check BoardID follow command
ioreg -l -p IODeviceTree | grep board-id
Even though yours was built in June, it's still an early 2015 model because that's when your model was released.
My 15" rMBP was built in March 7, 2015 but it's still a mid 2014 model.
Do you understand it better now?