that kind of choice is available only if I put the pen drive in the old pc, there I see two entries, one with UEFI and another without.
I tried to use the following command to create the live usb:
livecd-iso-to-disk --format --reset-mbr --efi
but at the boot I see 6 white text row declaring something not found or whatever, it stays a couple of seconds, very hard to read, then Manjaro boot options appear.
I will try with rufus next time, but should not be so difficult.
When you know that your windows install does have select the same options if you are going to use rufus.
Your bios should indicate you if this is running in LEGACY (Bios) or UEFI too. you can check it.
I will leave to you another post where another guy had a similar issue but it was because he needed install in BIOS mode and Fedora was not loading the live session. The post is important because will show you important information about BIOS/UEFI and about fedora. Check the post, sure will help you.
The already installed windows is on a GPT partition and the pc use the UEFI mode.
Of course to install manjaro I already disabled the secure boot and deleted the passphrase (or whatever was the name) created by Win during the first boot.
So I tried to create a F31 live usb using these information (UEFI/GPT) and rufus but the result doesn’t change: some lines declaring something not found and then the boot window created by Manjaro appears asking if I want to use manjaro or Windows.
For what I know, because Win has been installed in UEFI/GPT I cannot select the old bios mode, isn’t it?
So I need to install F31 in UEFI/GPT or loose the Win OS etc.?
1- Enable UEFI Secure boot you already has it disabled —> change to Enable (you are trying start from un UEFI usb so it should be on)
2-Secure boot Option -->disable like it is right now
3-You did delete all signatures so this step you don’t need change, (I also did install default secure boot keys from my BIOS manufacture, but it doesn’t /should care from your secure boot options is disable but maybe is important if you want enable again in the future and have a fresh keys without rest of others installers).
I want believe than your problem is just you did disabale UEFI when it need is enable. (Don’t forget check the USB than you did burn before you began the installation,in this case it did run.
LIVE usb Fedora has a Test check run it to see the burning was ok before you do continue)
Edit1: Sorry maybe i am wrong in these option. Because you should have Uefi enable and these option in your bios is only to disable secure boot and not uefi. But i think still that it is related with your bios options or fast boot from windows did you disable fast boot.
The options related to UEFI and these related to Secure boot are in two different pages of the bios options.
UEFI is enabled (and must be, because Windows has been installed in UEFI so I cannot install F31 in the BIOS mode) but the Secure boot option is disabled.
fast boot disabled (but now the OS selection is in charge of manjaro, so I don’t think fast boot can do anything until I select to boot windows)
Secure boot disabled.
I tried to enable secure boot but the only result is that to gain access to the bios I need to login the OS and select “open UEFI in the next start”, however the usb live shows always the same text.
I will try to boot an ubunto live usb and see if it works or not.