Hello Manjaro community. Here to ask a really specific question, but it may really be dumb so I post it here.
I want to install manjaro on my sister Acer Inspire V5. It was kinda tricky to get a liveboot to boot because of a hardware bug ( this specific model has a bug where you can only access BIOS (I know it's not the proper mod, but the screen where you can change secure boot and so on) through windows 8 recovery tool, but the disk with windows 8 died and just before I put the bootmode in BIOS/legacy). Also it has a strange feature where it will only boot to the internal disk.
It's not a real problem, I teared it apart, installed manjaro live on an HDD, booted from there (it booted in BIOS/legacy mode, not in EFI) , installed Manjaro to another disk with an adapter, it worked like a charm.
Then I put the disk with my manjaro installation inside. Now it gets tricky.
It won't boot.
I guess grub is installed to boot in UEFI by default nowadays. I put back my live CD, from the grub shell I boot into my manjaro installation, and reinstall GRUB as explained here ( Using livecd v17.0.1 (and above) as grub to boot OS with broken bootloader ) . Won't work.
I try again following the Archwiki ( https://wiki.archlinux.org/index.php/GRUB#BIOS_systems ). Won't work either.
What do I do now ? How do I install Manjaro to boot in legacy mod ?