Also I deleted the partitions created for the previous EndeavourOS installation, how is that possible?
Could you boot into the live ISO, and share the output of these commands so we can have a look at what’s going on:
sudo parted -l
efibootmgr
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I’ve restored the default setting of the BIOS and setup everythin once again like XMP and other stuff, now it boots into GRUB and EndeavousOS with no problem 
Anyway this is the output of the command you wanted:
sudo parted -l:
[xii69@xii69 ~]$ sudo parted -l
Model: KINGSTON SNVS2000GB (nvme)
Disk /dev/nvme0n1: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 106MB 105MB fat32 EFI system partition boot, esp, no_automount
2 106MB 123MB 16.8MB Microsoft reserved partition msftres, no_automount
3 123MB 274GB 274GB ntfs Basic data partition msftdata
4 274GB 275GB 813MB ntfs hidden, diag, no_automount
5 275GB 1726GB 1451GB ntfs Basic data partition msftdata
6 1726GB 1728GB 2147MB fat32 boot, esp
7 1728GB 2000GB 273GB ext4
and efibootmgr:
[xii69@xii69 ~]$ efibootmgr
BootCurrent: 0001
Timeout: 1 seconds
BootOrder: 0001,0000,0002
Boot0000 Windows Boot Manager HD(1,GPT,d9b06f57-71c9-4bbd-b760-8bfd1f6addcb,0x800,0x32000)/\EFI\MICROSOFT\BOOT\BOOTMGFW.EFI57494e444f5753000100000088000000780000004200430044004f0042004a004500430054003d007b00390064006500610038003600320063002d0035006300640064002d0034006500370030002d0061006300630031002d006600330032006200330034003400640034003700390035007d00000033000100000010000000040000007fff0400
Boot0001* endeavouros HD(6,GPT,5959f0ac-d335-4554-af42-a5ef9d8f72da,0xc8e08000,0x400000)/\EFI\ENDEAVOUROS\GRUBX64.EFI
Boot0002 UEFI OS HD(6,GPT,5959f0ac-d335-4554-af42-a5ef9d8f72da,0xc8e08000,0x400000)/\EFI\BOOT\BOOTX64.EFI0000424f
Also I choose this one for my /boot/efi partition, is it selected correctly?
6 1726GB 1728GB 2147MB fat32
And now how can I change the GRUB to be bootable from secure boot too?
Yes, that is correct.
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