In short, I need to get the system/BIOS to allow UEFI booting of the SSD. In UEFI boot mode, boot devices use these interfaces to request memory space from the BIOS memory manager. Unfortunately I erased the existing boot option (boot manager) by mistake. How to Enter the Dell Boot Menu Or, if you want to start from scratch, access your BIOS settings and make sure that the Boot Mode is set to UEFI and save the changes before you exit. When you encounter startup or operation problems on Dell computers, you can use Dell boot menu to access Startup Settings, Safe Mode, and various other startup methods to help you access and repair Windows 10. Dell Boot Menu. Computer started up today with default BIOS settings. Removing CMOS battery doesn't help either: Acer Aspire stuck in legacy mode. Acer E1-510 uefi to legacy: Where is the reset button on an Asus Legacy laptop: Bios option Boot Mode greyed out, can't change to Legacy; setting supervisor password doesn't help: After setting UEFI to legacy boot mode, laptop did not boot at all, no POST either. Boot into the Windows Recovery environment, find CMD prompt and run. Once UEFI is enforced as the default boot mode, use this article to clean install Windows 10. This almost annoys people because they can’t access Windows data. This article provides a step-by-step guide for recovering a damaged or deleted bootloader on Windows 10 and Windows 8.1 on computers running in native (non-legacy) UEFI mode. Now use the required function key to move the USB device to the top of the boot order, here I will be using the F6 key, so I will hit the F6 key until my USB device is on top of the UEFI Boot Order, then I will use the F10 Key to save an exit, then … For quick access to BOOT MENU Please restart the computer => while restarting the computer, press the key repeatedly F12 . Check the boot order and make sure your PC’s hard drive is in the first slot. Highlight Boot Mode, press Enter, and swap from UEFI to Legacy Support. If not, swap the order of boot devices so that your hard drive is first. When a system contains multiple boot devices, UEFI boot mode allocates memory on-demand for each device’s firmware. Here in my case is the USB Diskette on Key/USB hard disk. If you are not one of those people who have trouble setting up Dell UEFI via USB and can not boot Windows after trying many online tips, do not worry, here is an article to help you To start your Dell computer in Windows 10 /8.1/8. Only SSD 1(Windows boot) and SSD 2 were listed in BIOS; HDD 1 and HDD 2 were not visible System would not boot. In section Boot List Option you tick UEFI => then press Apply is done. And this is the boot menu of the Dell Inspiron computer, choose the device you want to boot into is complete. Setting the boot mode to UEFI. UEFI eliminates this limitation by defining standard interfaces for memory management. The Dell's I've deployed using (UEFI) all needed these BIOS setting changed: uncheck "Enable Legacy Options ROMs" in the Advanced Boot Options enable UEFI Network stack change SATA Operations to AHCI Enable Secure Boot Then using your arrow key, go down to your USB device under the UEFI boot order. bootrec /rebuildbcd. 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