Arduino for STM32

Yes, I added a resistor in parallel of 1.8K.
Win10 detected the USB but claimed it is malfunction.
I tried to pull boot1 switch and the DFU was detected but I was not sure how to continue to get a bootloader via USB that will enable 4 UARTS
Is there software UART that can be added to Blue Pill?

Thanks. I wasnt able to operate the roger bootloader. I got undefined usb connection on win10. So, I will stay with 3 uarts and now I am looking for software uart on mu bluepill.
Is it possible?

I am using this board https://www.ebay.com/itm/Minimum-System-Development-Board-STM32F103C8T6-STM32-Module-For-Arduino/274025677680?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 Model: STM32F103C8T6. Core: ARM 32 Cortex-M3 CPU. Debug mode: SWD. 72MHz work frequency. 64K flash memory ...

I am trying to use stm32f103c8t6 board with 3 serial ports : Serial 1,2,3
Serial 1,2 are able to compile, but I get error on Serial 3.
What is the problem?