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. Setting the boot mode to UEFI. This almost annoys people because they can’t access Windows data. After creating a UEFI bootable USB thumb drive with Rufus (using Windows 8.1 Enterprise ISO x64), for a Dell Optiplex 3010 (configured as UEFI only, no CSM, latest firmware version, Windows 8 installed), I didn't see a USB boot option, so I tried to add one manually. Unfortunately I erased the existing boot option (boot manager) by mistake. Check the boot order and make sure your PC’s hard drive is in the first slot. When a system contains multiple boot devices, UEFI boot mode allocates memory on-demand for each device’s firmware. How to Enter the Dell Boot Menu bootrec /rebuildbcd. In the BIOS setup menu, select the Boot tab and press Enter. In section Boot List Option you tick UEFI => then press Apply is done. Boot into the Windows Recovery environment, find CMD prompt and run. In UEFI boot mode, boot devices use these interfaces to request memory space from the BIOS memory manager. Dell Boot Menu. Under that option, swap UEFI to Legacy First UEFI eliminates this limitation by defining standard interfaces for memory management. Computer started up today with default BIOS settings. For quick access to BOOT MENU Please restart the computer => while restarting the computer, press the key repeatedly F12 . And this is the boot menu of the Dell Inspiron computer, choose the device you want to boot into is complete. 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 … In short, I need to get the system/BIOS to allow UEFI booting of the SSD. Windows boot problems are always common for Windows users. 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. 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 Removing CMOS battery doesn't help either: Acer Aspire stuck in legacy mode. The Dell laptop boot menu is essentially the Advanced boot options 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. The guide should help if Windows doesn’t boot due to missing or damaged boot configuration file \EFI\Microsoft\Boot\BCD. Then using your arrow key, go down to your USB device under the UEFI boot order. Once UEFI is enforced as the default boot mode, use this article to clean install Windows 10. If not, swap the order of boot devices so that your hard drive is first. 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. Highlight Boot Mode, press Enter, and swap from UEFI to Legacy Support. 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