Hello!
Is it possible to flash the CH32V003 MCU using the default factory bootloader & UART transmitter without WCHlinkE?
Are there any instructions and documentation?

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你好！

是否可以在没有WCHlinkE的情况下使用默认的出厂引导加载程序和UART发射器闪烁CH32V003MCU？

是否有任何说明和文档？

You can download the program by IAP+UART-IAP provided by us. In this way, the following projects need to be downloaded by linke for specific operations. Then you can download the program by UART1 instead of linke. Use linke to download the code in IAP, modify the user configuration word to jump into 0x1FFFF000 after execution, and then use wchlinkutility to download the IAP program in UART-IAP into 0x1FFFF000, then you can use UART1 to download your APP了

Thanks for your answer.

Is it possible to use the default factory bootloader without flashing of WCH USART_IAP example?

Sorry, there's no such way.