STM32 STM32F1 STM32F103C8T6

use this tool to erase ram first:

https://circuitdigest.com/microcontroller-projects/getting-started-with-stm32-development-board-stm32f103c8-using-arduino-ide

https://www.st.com/content/ccc/resource/technical/software/demo_and_example/group0/ab/79/74/9a/85/b0/4b/a1/flasher-stm32/files/flasher-stm32.zip/_jcr_content/translations/en.flasher-stm32.zip

setup for upload:

use this lib for neopixel/WS2812B: https://github.com/rogerclarkmelbourne/WS2812B_STM32_Libmaple

connect data pin to A7