Arduino for STM32

Not 100% why im experiencing these issues, likely because of incorrect bootloader. Workaround is to use this tool (https://my.st.com/content/my_st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-programmers/flasher-stm32.html#overview) for flashing ...

Alot closer! Thank you so much .rpv & fpiSTM, can't believe I let a comment fool me :shock:

The blink sketch is now compiling, but I'm receiving these errors when flashing the STM32L1 via FTDI to USART serial1 (PA10(rx) & PA9(tx)) with both the arduino ide, and STM32 Cube programmer ...

Hello,

I've been stuck on this for a few days, i'm sure the solution is trivial but I need more experienced eyes.
I'm trying to add my own stm32 board into arduino so i can work with it.

What i've done:
Ive installed the stm32duino arduino core , and ive tested i can build a script for a board ...