I successfully installed bootable usb windows like 1909, 20h2 and 21h2.
To experiment what 1507 would look on my laptop, I tried but the laptop seems to freeze at the start logo and it keeps circling for hours.
Is it some incompatibility with the motherboard or bios ?
I saw many people in this forum working with old windows 10 versions, or windows 8 or 7 on what seemed like fairly recent laptops. So I think it could be possible.
For reference, my laptop is lenovo y530 from 2019.
Thanks