How do I remove unneccessary boot device options?

Question

Long story short: had win8, decided to make dualboot, installed manjaro linux (mounted /boot/efi to windows' efi partition), oh noes grub doesnt show option to log into win8, managed to create win8 option via grub-customizer, logged into win8, decided to remove manjaro, created recovery usb via win8, used this guide, deleted manjaro partitions, oh noes there were unneccessary boot options, mounted efi partition in win8 and deleted manjaro, gummiboot folders and grub.cfg hoping that they'd dissapear. They didn't.

So how to remove these unneccessary options?

Solution

These entries are stored in UEFI’s NVRAM. You could use efibootmgr on Linux (has to be UEFI-booted) to remove/manage them. This program should be available (either installed by default or from the repositories) on all recent Linux distributions.

Run efibootmgr as root to get a list of boot entries:

[root@db-nb-11 ~]# efibootmgr
BootCurrent: 0019
Timeout: 0 seconds
BootOrder: 0019,000C,000A,0006,0007,0008,0009,000B,000E,000F,0010,0011,0012,0013,000D
Boot0000  Setup
Boot0001  Boot Menu
Boot0002  Diagnostic Splash Screen
Boot0003  Startup Interrupt Menu
Boot0004  ME Configuration Menu
Boot0005  Rescue and Recovery
Boot0006* USB CD
Boot0007* USB FDD
Boot0008  ATAPI CD0
Boot0009  ATA HDD2
Boot000A* ATA HDD0
Boot000B  ATA HDD1
Boot000C* USB HDD
Boot000D* PCI LAN
Boot000E  ATAPI CD1
Boot000F  ATAPI CD2
Boot0010  Other CD
Boot0011  ATA HDD3
Boot0012  ATA HDD4
Boot0013  Other HDD
Boot0014* IDER BOOT CDROM
Boot0015* IDER BOOT Floppy
Boot0016* ATA HDD
Boot0017* ATAPI CD:
Boot0018* PCI LAN
Boot0019* Arch Linux

You might notice that most of these entries aren’t relevant to you. Better take care not to delete anything important, who knows what might happen. ;)

To delete entry Boot0019, you’d have to execute the following command:

bootmgr --bootnum 19 --delete-bootnum

Or, if you like short options:

bootmgr -b 19 -B

Comments

[foxneZz]

In-depth guide would be nice

[Daniel B]

Well, here you go, @foxneZz.

[foxneZz]

when I install grub, do I have option to boot windows via boot device selection menu or only through grub? I just forgot to look when I had manjaro. If I fk up my system I would need to find another windows 8 computer or try recovering through liveusb which can be troublesome. Always having option to boot windows through boot menu makes experimenting with linux much easier. I plan to install Arch linux btw :) @Daniel

[Ramhound]

Why don't you just use EasyUEFI If you don't have an Windows 8.1 installation disk go ahead and download one from Microsoft using the tool.

[Ramhound]

Here is the source material for this answer

[foxneZz]

I have Win8 iso. But I only have one flash drive. EasyUEFI seems to be exactly what I've been looking for.