I've used the Y000 bit pretty extensively on the 7 Plus, and it's the same bit that we used for all our guides and teardowns for both phones. It also works for the Watch, which has much smaller screws. I'm afraid we don't make anything smaller!
I will say that the tri-point screws sometimes require more pressure than I'm accustomed to, in order for the driver to bite. I think it's because the heads are so shallow; the driver needs to be really snug and absolutely on-axis in order to get any traction on the screw head.
I'd suggest giving it another whirl! On the off-chance you got some kind of defective bit (it's very rare, but it happens), reach out to our customer service team for a replacement. Good luck!
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I have two of the bits, and neither of them have worked for me on the iPhone 7. (Will check the iPhone 7 Plus on my next repair.) But I have a Y0000 screwdriver that works fine for the iPhone 7.
Thanks for the reply.
crwdns2934271:0crwdnd2934271:0 Aaron Lopez crwdne2934271:0