Question about Microsoft Surface Pro X

Hello all I have been using the unit for three days now. Everything is wonderful and the unit runs really well. However, my idea was that I will replace the SSD. I have now tried almost everything and am at a standstill, unfortunately I don't know what to do. The machine does not recognise any USB devices when booting. So I can't boot from the USB stick, although I have set everything. I have already tested the following: Secure Boot deactivated BitLocker deactivated Created a recovery drive on two different SD cards and a USB stick. Downloaded a system image with the product information directly from Microsoft Changed the boot order in UEFI Nothing works... The unit won't even boot from the USB with the original SSD, I find that very strange. I just can't get it to recognise the USB devices and then boot from there. I hope someone else has a good idea, I'm running out of them now. Thank you very much.