If your Windows PC is booting in EFI mode, Microsoft has blocked the loading of legacy or non-Windows operating systems from the BCD menu. This means that you can no longer use EasyBCD to add Windows 9x, XP, or Server 2003 entries to the BCD bootloader menu. You also cannot add DOS, Linux, BSD, or Mac entries. You can add multiple Windows Vista, Windows 7, Windows 8, and Windows 10 entries; and you can also boot into BCD-based portable media, such as WinPE 2.0+ images.
EasyBCD is 100% UEFI-ready. In UEFI mode, much of EasyBCD’s functionality will be disabled for the safety of your PC. It abides by the restrictions Microsoft has placed on the bootloader that will block any attempts to load non-Microsoft-signed kernels (including chainloaders) from the top-level BCD menu, and it will create 100%-compliant UEFI entries other installed Windows operating systems on your PC. These limitations are not short comings of EasyBCD nor can they be lightly bypassed, they have been put in place by Microsoft.