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#11
I managed to boot the system again, after using Recovery with the Secure Boot option previously set to Enabled.
Now, inside W8.1 I used bcedit and it returned EFI\refind\refind_x64.efi in the path option.
Since the problem started when I used bcdedit /set {bootmgr} path \EFI\refind\refind_x64.efi, I used now
bcdedit /set {bootmgr} path \EFI\Microsoft\Boot\bootmgfw.efi to set it back to the default. The problem is, the first command was done in W10, is the path that I have set now the correct one for W8.1? How can I know if the system boot when I restart it?