Windows installed in CSM (in theory) doesn't show up in Grub, Dual Boot

[hardy nymph]

Oh it's hard to explain everything in the title
So Windows was installed in CSM mode, so Grub doesn't auto detect it and to fix it I needed to reinstall windows and obviously, keep the file. Is there a way to fix this problem without re-installing it?

[carmine idol]

first confirm it is for sure. in Windows, type in a Run box: msinfo32

and check the BIOS mode:

if it indeed confirms it to be Legacy, then I think there's a way to convert it.

you should back up all the files you really value to an external drive anyway first as backup

https://www.youtube.com/watch?v=hfJep4hmg9o

[hardy nymph]

Oh well, I'm actually on Linux

I can't boot on Windows because there's no Windows Boot Manager in UEFI, that's the problem. I think Grub corrupts it (?)

also yeah it's gpt

Before I updated to windows 11 and it appeared on grub but I reinstalled linux to make a few ui changes and it's gone

[carmine idol]

windows 11 demands GPT-style drive AND UEFI

So it can't have been legacy

[hardy nymph]

But that's not the problem because Windows 10 was GPT but Legacy

So my guess is that it's still legacy

[carmine idol]

either reinstall both fresh

[hardy nymph]

I can try to update again since it fixed it 🤷‍♂️

[carmine idol]

and turn off csm/legacy in bios

[hardy nymph]

Alright

[carmine idol]

or try supergrub2

it's a bootable usb "loader"

that u can use to find and boot ur windows install

then convert it as per the video

[hardy nymph]

Even without the Windows Boot Manager?

[carmine idol]

#1200928716415566005 message

[bronze bobcat]

if you don't have windows boot manager, the issue is seperate Nd grub can't do anything either. grub just chainloads the wbm.

[carmine idol]

yes u use its orange screen to boot an OS, it scans all drives and finds bootable items. in ur case probably NOT EFI files for windows

[hardy nymph]

How is the issue seperated? Grub isn't responsible for breaking it?

[bronze bobcat]

you can see what stunner said. but it may be quicker to just use Linux, mount the windows EFI (skip this if it's shared between windows and linux) and look in /.../efi/EFI/Microsoft/[].efi or for a shared one, /boot/efi/EFI/Microsoft

[bronze bobcat]

WBM suddently disappeared from your firmware after you installed linuxmint?

[hardy nymph]

Before updating it
I was able to access to the legacy boot manager of windows
There was WIndows 10 and Windows 7 (restored) and I couldn't boot Windows 10 and gave me an error, it was like it couldn't load winload.exe, something like that

[hardy nymph]

I'm not using Linux Mint but endeavouros

[bronze bobcat]

still

[carmine idol]

two OS's MUST be in the same mode (both installed as, started as, and run as) in order to work harmoniously thru GRUB

also if u do fix it, make sure to turn Windows Fast Startup off for proper reliable dual-boot

[hardy nymph]

Yeah I think that's the overall problem
I think updating it again should work

[hardy nymph]

I don't remember if I have fastboot on, maybe I do

But when I fixed it, it was able to load WBM

[carmine idol]

u may try booting linux mint off a usb and use its boot repair tool

otherwise see the suoergrub link and the video

[bronze bobcat]

can you do efibootmgr in the terminal just to confirm?

[carmine idol]

or get mx linux fluxbox version, it's abit smaller ISO to download, and has boot repair tool too

[hardy nymph]

BootCurrent: 0005
Timeout: 1 seconds
BootOrder: 0005,0000
Boot0000* GRUB HD(1,GPT,aabd290a-6bbb-495f-b25d-47fd86121e29,0x1000,0x200000)/\EFI\GRUB\GRUBX64.EFI
Boot0005* UEFI OS HD(1,GPT,aabd290a-6bbb-495f-b25d-47fd86121e29,0x1000,0x200000)/\EFI\BOOT\BOOTX64.EFI0000424f

[bronze bobcat]

do look what stunner said

[hardy nymph]

I actually think that updating windows again could work
I will stay on UEFI mode

Also it's easier for me

[bronze bobcat]

what are you even updating

just reinstall windows

[hardy nymph]

cuz it worked before

[hardy nymph]

I can't format it

[bronze bobcat]

why?

[hardy nymph]

Important stuff and like the 75% of the 1tb is taken

[bronze bobcat]

make a backup, then.

[carmine idol]

should have a backup at all times anyway

of important work or valuable data

[hardy nymph]

Ask my father for that 😭, the hard drive isn't mine

[hardy nymph]

Quick update, fuck Grub

[bronze bobcat]

grub will do what you tell it to and if it's physically possible

no one updates their system from win7 to 11, they just reinstall.

such upgrades almost always will break something, because of how much things change between windows versions

it you don't have a windows bootloader, then grub won't be able to boot it either.

there's a reason why legacy boot is depracted

[hardy nymph]

but seems like possible?

for systemd-boot

[hardy nymph]

When there was W10, there were always random errors of dll popping up randomly

[bronze bobcat]

systemd-boot is uefi-only

[hardy nymph]

oh I dunno then

[bronze bobcat]

brother, just install windows 10 or 11 LTSC and move your files there if you hate backups so much

[hardy nymph]

LTSC is strictly English I think

[bronze bobcat]

no, LTSC is just windows but long-term support channel

so localised builds exist too.

[hardy nymph]

NOO HE LEFT

Hey stunner, thanks for helping but I was able to fix it alone

@carmine idol

Now it runs on UEFI mode completely and Grub recognizes it correctly

Instead of winload.exe now it's winload.efi

I basically ran the windows media installation USB, used CMD to find the windows boot and then "guided" windows to use the correct one