Operating System Loader Failed Signature Verification

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If that does not work, you can edit a couple of uefi variables to unlock cpu voltage control. Xps 7590 1. 6. 0 uefi: Unlock undervolting and remove cfg lock from dell. > as soon as i attempt to start the boot sequence, i get this error:

The file may > have been tampered with > > i've tried. 早速エラー画面を送ってもらうと「 operating system loader faild signature verification. warning: The file may have been tampered with! All bootable devices failed. My dell laptop inspiron 5559 after a windows 10 update keeps showing operating system loader has no signature. Incompatible with secure boot. All bootable devices failed secure boot. Reset bios to default settings and reset the laptop (no more actions here). Enter to bios (f2) and select boot sequence menu.