但是一直没成功，我下了官网的最新版本2.8，不知道哪里出了问题

下面是版本说明是不是还不支持啊
* V2.8.0 - 01-September-2015
===============================

New Features
************
    + Adding support of STM32L4x6xx devices
        + Adding support of STM32L0xx 192K of flash devices
        + Adding support of STM32F74x/5x devices
        + Adding support of STM32F412xx/F410xx/F446xx/F469xx/F479xx devices
        + Adding support of STM32F303/302xD/E devices
        + Fix com port up to 255
        + Fix GUI/command line version supporting .bin at an address offset different from base address
        + Fix STUARTBLLIB.dll to support non-aligned address at end of flash area. But data should be always multiple of 4 bytes.
       
       
Known Limitations
*****************
    + Options Bytes management of STM8, STM32L1/L0/L4 and STM32F0/2/3/4/7 devices is supported only in Command line version
      for batch programming,
    + Automatic selection of some STM8 devices may not work properly. If required, use
      command line version with batch files customization,
    + on Some STM32 MCus Write protection of last pages which is controlled by the last protection bit7
      in WPR3 options byte is working properly but the Graphical view of check boxes may not updated
      accordingly on some devices with large size greater than 128Kbytes.
      To enable/disable the write protection of last pages, you can check/uncheck only the first
      page of this group of pages on the graphical view.
    + STM32L "Erase all" feature is not supported. See AN2606 for more details.

TOPCB 发表于 2018-10-19 17:01
有Flash Loader

我试了，一直不识别，不知道哪里出了问题了。请问您之前用过吗

应该可以用FLASH LOADER，注意BOOT管脚要设置为“Boot from embedded SRAM”


另外要注意用USART1还是USART3。