Help me Dualboot Windows 7 with Windows 10

Hello everyone! I want to make a dualboot Windows 7 on the ASUS Vivobook 15 X513EAN (K513EA) laptop. To be honest, I tried different methods: via Flashboot Pro, different images for this, but nothing helped. And another joke of this laptop is that UEFI Class 3 or UEFI Class 3+ is installed there (I don’t know which one exactly), which means that there is no CSM. And because of this, half of the methods break. In short, just help!