DISCLAIMER: I am not responsible if you fuck up your bootloader, please consider this as a last resort/experiment. You should learn the basic ins and outs of your BIOS before proceeding.
- The rEFInd boot manager
- rawwrite dd for Windows
- checkn1x ISO, grab the one for your CPU architecture
Follow this guide,
Open Disk Management as administrator (Windows key -> type 'disk management', right click and Run as Administrator)
Right click a volume and select Shrink Volume
Enter the amount you want to shrink (for checkn1x we only need 1GB max)
Right-click the newly unallocated space and select 'New Simple Volume'. Follow the on-screen instructions, NTFS/FAT32 is fine.
Make note of the drive letter Windows assigns.
Extract dd-0.6beta3.zip into its own folder, then copy the checkn1x ISO into it.
Open a command prompt as administrator, then navigate to the folder with cd (Tip: click on the path bar in Explorer to get an easily copiable path to current folder.)
Run the folllowing command: (DOUBLE CHECK CAREFULLY, ONE WRONG KEYSTROKE AND YOUR DATA/WINDOWS COULD BE GONE!)
dd.exe if=<checkn1x-iso-file> of=\\.\<driveletter>: bs=1M --progress
For example, if your iso file is named checkn1x-1.1.7-extradummythicc-x86_64.iso and your drive letter is G, type the following:
dd.exe if=checkn1x-1.1.7-extradummythicc-x86_64.iso of=\\.\g: bs=1M --progress
Wait a second for command to finish, then reboot. You should be greeted with the rEFInd boot menu, use left/right arrow keys to boot to checkn1x (usually at the end of list)
Run in Administrator command prompt.
mountvol R: /S
R:
bcdedit /set "{bootmgr}" path \EFI\Microsoft\Boot\bootmgfw.efi