Boot to windows GRUB - load the kernel first

[Rebootwindows]

I changed my OS to Linux Mint and am trying to change it back to Windows 10. I installed Windows 10 onto my usb stick. I disabled the Macintosh devices which must be my actual laptop and enabled the usb stick. Then I'm in GRUb cli.

I set the prefix:

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set prefix=(hd0,msdos1)/Win10_21H1_English_x64/Win10_21H1_English_x64.iso

2. Set root:

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set root=(hd0,msdos1)

3.

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chainloder /Win10_21H1_English_x64/Win10_21H1_English_x64.iso 

This reloads grub and when I run

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boot

, I receive

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error: you need to load the kernel first.

I tried to load the kernel but don't know what a root partition is and just struggling to get it to work.

Also, if I don't disable the other devices which I presume is my actul laptop, it just restarts my laptop normally (with Linux Mint OS).
Can someone please help? I'm new to this. Any help would be appreciated.