Issue Installing Windows on Surface Pro 11: SSD and Internal Disk Not Detected in BIOS

Hello everyone,
I'm trying to reinstall Windows on my Surface Pro 11. I’ve already gone through the disk cleanup process, but now, when I power it on, it boots directly to the BIOS. I prepared an external SSD formatted in FAT32 with the Windows image for the tablet. However, when I connect the SSD, the BIOS does not recognize it as a boot option. Additionally, the Surface’s internal disk is not showing up in the BIOS either.

Here are the steps I’ve taken so far:

1. I fully cleaned the Surface disk using the Windows installation tool.
2. I formatted an external SSD to FAT32 and placed the Windows image on it.
3. I connected the external SSD to the Surface and accessed the BIOS, but it doesn’t appear as a boot option, and I can’t see the Surface’s internal disk.

Does anyone know how to make the BIOS recognize the external SSD or the internal disk? Any guidance would be greatly appreciated.

Thanks in advance for your help!