Try using a small 1.5mm or 2mm flat head screwdriver to notch out anchor points in the head and unscrew it.

P6 (also known as TS5 or 1.5 mm): MacBook Pro 15″ (2009) Battery I stripped the head. P5 (also known as TS4 or 1.2mm): MacBook Air from 2010 onwards, MacBook Pro with Retina Display, MacBook Pro with USB-C, 12″ Retina MacBook. P2 (also known as TS1 or 0.8mm): All iPhone models from iPhone 4 to iPhone X (previous iPhones used standard Phillips #00 screws) Which size of screwdriver is needed for which device? If you do manage to strip the head, there are a few things you can try below. You will, invariably, strip the head and once you’ve done that, there’s no way to undo the screw, even with the correct screwdriver. First, whatever you do, don’t try to open a Pentalobe screw with a normal Phillips or Torx screwdriver. There are several different sizes of Pentalobe screws in use by Apple. They are now used in all Apple laptops and phones. Starting with the Mid-2009 15″ MacBook Pro, Apple began to use special 5-point security screws, in an attempt to prevent users from accessing the internals of their devices.

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Screwdriver for macbook pro 2015