Just when the Superfish fiasco has blown over, Lenovo is yet again being dragged into the hot seat for yet another potential security risk done for the sake of installing bloatware. The Lenovo Service Engine or LSE, which for sure will soon have a more degratory moniker, was discovered to be modifying particular Windows system files, which in turn downloads a special Lenovo software (a.k.a blaotware). The real kicker here is that LSE continues to work its magic behind the scenes even if you reformat and reinstall Windows.
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https://www.slashgear.com/lenovo-responds-to-service-engine-bios-software-debacle-12396812/