Dualboot not working, cannot access BIOS, Stuck in grub rescue

[Dubbox]

I am really not well informed in this topic, i just Followed the mentioned tutorial. In terms of partitions it says:

@linux-aarhus

• Reboot your computer to the live USB media.
• Launch the graphical installer - it is named Calamares.
• Follow the guide until you reach the Disk selection/preparation
• Select Manual partitioning → Next .
• Select the correct disk selected - should be easy to see.
• EFI PARTITION
  Select the unpartitioned space → Create
  a. Size → input 512
  b. Filesystem → select FAT32
  c. Mountpoint → select /boot/efi
  d. Flags → check boot → OK
• SWAP PARTITION
  Select the unpartitioned space → Create
  a. Size → input 2048
  b. Filesystem → select linuxswap → OK
• ROOT PARTITION
  Select the unpartitioned space → Create
  a. Size → input 20480 (min. recommended size)
  b. Filesystem → select ext4
  c. Mountpoint → select / (root) → OK
• HOME PARTITION
  Select the unpartitioned space → Create
  a. Size → Use remaining
  b. Filesystem → select ext4
  c. Mountpoint → select /home → OK
• Next
• Continue with the guide and when finished do not reboot .
• Open a terminal
• Input efibootmgr → Enter
• Verify the BootOrder - you should have a manjaro entry and the corresponding number should be first in the BootOrder

In addition, I just set the root and swap flags respectively to the partitions, which is not mentioned in the tutorial, but I do not think this may be a problem? I thought this may be cleaner.

After following the tutorial not manjaro booted but windows. The tutorial also had an answer for this which was to do the following in windows:

@ManjaroBlack

• Run CMD as Administrator
• bcdedit /set {bootmgr} path \EFI\manjaro\grubx64.efi
• Reboot

I did so and then the problem appeared.

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Regarding the boot thing you mentioned would this then be the correct way?

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And can i do the uefi thing from the grub rescue? I do not know if I did this or not, I did not read about it explicitly in the tutorial.