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My Dell XPS15 9550 won’t boot - stuck during boot in “preparing automatic repair”. How can I get my data?

You’ll need a PCIe adapter to house the M.2 SSD so you can access the files from a second system. Here’s one option: 3-Port M.2 SSD (NGFF) Adapter Card - 1 x PCIe (NVMe) M.2 Unlike mSATA M.2 SSD’s the PCIe SSD’s need direct system bus access.