HowTo manage GPT UEFI dual boot (Win10/Win7)?

Operating Systems Windows 7/Vista/Server 2008
1

Hello,
I have experience with Legacy partitions but totally inexperienced with UEFI.
I have two hard disk with two separate installations, win10 and win7.
Under MBR, windows 10 allowed me to selected which OS to load.
I needed to change to UEFI, fixed win10 bootloader and all is fine with this.
I would like to use win7 as well but I have an hard time to find a way to do it.
I need to keep the installation, cannot afford to reinstall win7.

Can you help?


Edit by Fernando: Thread moved into the “Windows 7” Category and title customized

2

Use BootICE in WinPE, open BCD file in win10’s ESP partition, edit it, add win7 item, set legacy menu (no Metro). Then delete win7’s ESP partition or rename win7’‘s bootmgfw.efi etc.

This is to use win10’s bootmgfw.efi to load win7’s winload.efi. I tried on 7/10 and 7/11 dual boot.