There must be a quality control issue with production of the PH000 bits. This is the third battery I’ve ordered, and I needed another kit because my pentalobe bit was damaged and no longer working. Anyway, the PH000 bit that came with my new kit is significantly larger than the one that came with my original kit and will under no circumstances remove the 1.6 mm screw. I pulled out the old kit, used the smaller PH000 bit and had absolutely no problem removing the screw. That would explain why some people are having zero issue with the screw and others are unable to remove it.
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