MCU on Ender 3-S1 not Flashing

Basic Information:

Creality Ender 3-S1
Stock MCU (STM32F401)
Raspberry Pi 3B+

Flashing Won’t work

When I flash the MCU I get this

I tried everything that I could, but it still won’t work.

If more Info is needed just let me know

(I’m also new to all of this so I appreciate the help)

If it is your first time installing Klipper, then you need to flash via SD card.

Ok so I put it on an sd card and flashed it, but now the LCD is stuck on the splash screen

This is expected as Klipper does not support the S1 display.

Mainsail is saying that the printer is not ready