https://fosswire.com/post/2009/05/restoring-overwritten-grub/
edit /etc/default/grub add or uncomment GRUB_DISABLE_OS_PROBER=false save that file then run sudo update-grub or sudo grub-mkconfig -o /boot/grub/grub.cfg Endeavouros disabled os-prober by default.
i did that before when trying to get windows to be a entry
Post
efibootmgr
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Did grub worked before ? i mean could you boot strait into grub and had windows as a boot option keep in mind if you had windows wants always be the first option not the second because if it is second grub will be over written most of the times after a windows update.
grub didn’t work before
can you go into your bios and take a look what the settings are there ? what is the first boot device ? is that windows or the partition where endeavouros is installed ?
the first boot device is the windows boot manager but i can’t change to anything else thats on the ssd the other one is the a usb a dvd drive and things like that
For the third and last time give us some hardinfo:
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If you want support to fix your system issue, you have to provide information that is requested.
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Model: ATA CT250MX500SSD1 (scsi)
Disk /dev/sda: 250GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 106MB 105MB fat32 EFI system partition boot, esp
2 106MB 123MB 16.8MB ext4 Microsoft reserved partition msftres
3 123MB 134GB 134GB ntfs Basic data partition msftdata
4 134GB 135GB 664MB ntfs hidden, diag
5 135GB 187GB 52.4GB ext4
6 187GB 234GB 47.2GB ext4
7 234GB 250GB 15.7GB linux-swap(v1) swap
BootCurrent: 0003
Timeout: 0 seconds
BootOrder: 0001,0003
Boot0001* Windows Boot Manager HD(1,GPT,78ddc363-f03a-40c3-928a-1e5fd7f30075,0x800,0x32000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)57494e444f5753000100000088000000780000004200430044004f0042004a004500430054003d007b00390064006500610038003600320063002d0035006300640064002d0034006500370030002d0061006300630031002d006600330032006200330034003400640034003700390035007d00000061000100000010000000040000007fff0400
Boot0003* Grub HD(1,GPT,78ddc363-f03a-40c3-928a-1e5fd7f30075,0x800,0x32000)/File(\EFI\endeavouros\grubx64.efi)
# GRUB boot loader configuration
GRUB_DEFAULT="EndeavourOS Linux"
GRUB_TIMEOUT="15"
GRUB_DISTRIBUTOR="EndeavourOS"
GRUB_CMDLINE_LINUX_DEFAULT="nowatchdog nvme_load=YES resume=UUID=d4d0b914-842f-40b8-a8e2-5945058ad545 loglevel=3"
GRUB_CMDLINE_LINUX=""
# Preload both GPT and MBR modules so that they are not missed
GRUB_PRELOAD_MODULES="part_gpt part_msdos"
# Uncomment this option to enable os-prober execution in the grub-mkconfig command
GRUB_DISABLE_OS_PROBER="false"
# Uncomment to enable booting from LUKS encrypted devices
#GRUB_ENABLE_CRYPTODISK="y"
# Set to 'countdown' or 'hidden' to change timeout behavior,
# press ESC key to display menu.
GRUB_TIMEOUT_STYLE="menu"
# Uncomment to use basic console
GRUB_TERMINAL_INPUT="console"
# Uncomment to disable graphical terminal
#GRUB_TERMINAL_OUTPUT="console"
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `videoinfo'
GRUB_GFXMODE="auto"
# Uncomment to allow the kernel use the same resolution used by grub
GRUB_GFXPAYLOAD_LINUX="keep"
# Uncomment if you want GRUB to pass to the Linux kernel the old parameter
# format "root=/dev/xxx" instead of "root=/dev/disk/by-uuid/xxx"
#GRUB_DISABLE_LINUX_UUID="true"
# Uncomment to disable generation of recovery mode menu entries
GRUB_DISABLE_RECOVERY="true"
# Uncomment and set to the desired menu colors. Used by normal and wallpaper
# modes only. Entries specified as foreground/background.
#GRUB_COLOR_NORMAL="light-blue/black"
#GRUB_COLOR_HIGHLIGHT="light-cyan/blue"
# Uncomment one of them for the gfx desired, a image background or a gfxtheme
GRUB_BACKGROUND="/usr/share/endeavouros/splash.png"
#GRUB_THEME="/path/to/gfxtheme"
# Uncomment to get a beep at GRUB start
#GRUB_INIT_TUNE="480 440 1"
# Uncomment to make GRUB remember the last selection. This requires
# setting 'GRUB_DEFAULT=saved' above.
#GRUB_SAVEDEFAULT="false"
# Uncomment to disable submenus in boot menu
GRUB_DISABLE_SUBMENU="false"
# Probing for other operating systems is disabled for security reasons. Read
# documentation on GRUB_DISABLE_OS_PROBER, if still want to enable this
# functionality install os-prober and uncomment to detect and include other
# operating systems.
GRUB_DISABLE_OS_PROBER="false"
Run in a terminal:
sudo efibootmgr -o 3,1
Post terminal contents after you run the command.
BootCurrent: 0003
Timeout: 0 seconds
BootOrder: 0003,0001
Boot0001* Windows Boot Manager HD(1,GPT,78ddc363-f03a-40c3-928a-1e5fd7f30075,0x800,0x32000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)57494e444f5753000100000088000000780000004200430044004f0042004a004500430054003d007b00390064006500610038003600320063002d0035006300640064002d0034006500370030002d0061006300630031002d006600330032006200330034003400640034003700390035007d00000061000100000010000000040000007fff0400
Boot0003* Grub HD(1,GPT,78ddc363-f03a-40c3-928a-1e5fd7f30075,0x800,0x32000)/File(\EFI\endeavouros\grubx64.efi)
Reboot to test.
didn’t work
Take a look at his esp partition ! thats a bit weird looking , 1 1049kB 106MB 105MB fat32 EFI system partition boot, esp <<<<
Yes. It is weird. It is a partition. It should have been a cat. 
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correct 
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Post :
efibootmgr -v
ls -R /boot/efi
I assume your ESP is at /boot/efi. Confirm in /etc/fstab the vfat partition mount point and adjust the command if it is different.