STM32F103C8T6 & ArduinoIDE "Failed uploading: no upload port provided"

[Bruur-vr]

Hello all,

I've been tinkering with some STM32F1 boards since 2 weeks now. I want to use them for a project but seem to fail to program anything (except a blink through ST-link).

I searched the forums for a solution but everything I tried has led to the same result. I try to upload the proved Blink program through arduino IDE:

Sketch uses 23948 bytes (36%) of program storage space. Maximum is 65536 bytes.
Global variables use 4392 bytes (21%) of dynamic memory, leaving 16088 bytes for local variables. Maximum is 20480 bytes.
Failed uploading: no upload port provided

If i'm not mistaken then I can only upload with arduino IDE (over USB) after flashing a bootloader unto the Blue Pill. I got the HID bootloader out of BluePill-Plus-master\SDK\STM32F103C8T6\Arduino\Bootloader.

I tried:
Different methods of uploading bootloader:

• Bootloader mode by pressing Boot0 (onboard LED does not flash) > Connect ST-link to PC > downloaded .bin (STMprogrammer [Full chip erase, download file, verify, software reset enabled) > Boot 0 not pressed (Becomes pulled down: GND through 10k R) > press reset.
  That works (LED fast blink & see attached image of USB viewer)
• Bootloader mode by pressing Boot0 & PA0 (onboard LED does not flash) > Connect ST-link to PC > downloaded .bin (STMprogrammer [Full chip erase, download file, verify, software reset enabled) > Boot 0 & PA0 not pressed (PA0 becomes floating, and Boot0 becomes pulled down: GND through 10k R) > disconnect.
  It gives the same result as pressing only Boot0, as expected (STM's AN2606 Application note page 22 says both are a pattern to enter bootloader).

Different methods of uploading Blink:

• (after downloading with STlink) Arduino IDE > connect USB C cable > settings as in image > download BLINK (proviced by WeAct, onboard LED = PB2) > error.
• (after downloading with UART converter)Arduino IDE > connect USB C cable > settings as in image > download BLINK (proviced by WeAct, onboard LED = PB2) > error.
• (after downloading with UART converter)Arduino IDE > connect USB C cable > Press and hold boot0, hit reset once (LED turns off) > settings as in image > download BLINK (proviced by WeAct, onboard LED = PB2) > error.

Items used:

• STM32F103C8T6 BluePill+ from official WeAct
• ST link V2 (probably clone, but has been working without fail)
• AZDelivery CP2102 USB to TTL converter
• STMprogrammer to flash HID bootloader
• HID bootloader provided by this github.
• Arduino IDE 2.3.1 (& now downgraded to 2.2.1, to see if it fixes anything)
• ST32M (official) core
• USB C data cable (I can upload from phone with the same cable)

Arduino settings used:
Settings in IDE

I can find the device in device manager under HID devices (named: USB input device), and USB device viewer can read the HID bootloader on it.
USB viewer

I have no clue where to look, would someone be so kind as to help me with this issue?