Arduino for STM32

I got it to work. I had to hold the reset button as I then ran the command:

$st-flash write CODE.bin 0x08000000

I did have to try it a few times, unplug/plug the ST-Link usb, etc.. but the key was that I had to hold the reset button as I ran the upload.
once it began to flash, I released the ...

I think that my issue is that it does enter boot mode.. it is able to erase the memory, but it just won't let me write.

Thank you all for pointing me in the proper direction. I will take a look at those options and threads.

After posting this, I somehow got the board to show up in my STM32CubeProgrammer app. I am using mac os, so I don't have a "device manager".
I don't have an st-link v2, but I may try.

I am using a mac running BigSur 11.7.1
I have a STM32F411CEU6.
I installed STM32CubeProgrammer v 2.12 (I also tried 2.11 and 2.10)
In the Arduino IDE, I use STM32 libraries version 2.2.0

I have set the following options in my IDE.

Board Generic STM32F4 series, Board part number BlackPill F411CE ...