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The Flash Loader Tool 7.5.0 is a software application developed by STMicroelectronics designed to program the internal Flash memory of STM32 microcontrollers via the USART (Universal Synchronous/Asynchronous Receiver-Transmitter) bootloader.
Unlike traditional JTAG/SWD programmers (like ST-LINK or J-Link), this tool communicates using the built-in bootloader residing in the system memory of the STM32. This bootloader is factory-programmed and cannot be erased, making it a failsafe method for programming.
Version 7.5.0 represents a mature iteration of the tool, known for stability, broad device support (including STM32F, STM32L, STM32H series, and legacy STR7/STR9 families), and the ability to handle various protocols such as UART, I2C, SPI, and CAN. flash loader tool 7.5.0
STMicroelectronics no longer distributes v7.5.0 via their main website (archived since 2018). It may be found on:
Recommended alternative:
Use STM32CubeProgrammer 2.16.0 or newer – supports UART bootloader mode identically but adds modern features and security. The Flash Loader Tool 7
Newer tools like STM32CubeProgrammer have largely replaced the legacy Flash Loader. So why dedicate an article to version 7.5.0?
Note: For new projects, ST recommends STM32CubeProgrammer, but Flash Loader 7.5.0 is often pre-installed in legacy workflows and industrial machines. Recommended alternative: Use STM32CubeProgrammer 2
| Feature | Flash Loader 7.5.0 | STM32CubeProgrammer | |---------|--------------------|----------------------| | CLI support | ❌ | ✅ | | UART bootloader | ✅ | ✅ | | USB DFU | ❌ | ✅ | | SWD/JTAG | ❌ | ✅ | | GUI usability | Simple, dated | Modern, feature-rich | | Automation | No | Yes (scripts) |
To enter the system bootloader:
The tool enables flashing of binary or Intel HEX files into STM32 devices without needing a debugger (like ST-LINK). It communicates through the device’s USART1 (or other remappable USARTs) using a proprietary protocol embedded in the STM32 system memory bootloader.
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