Flash Loader Tool 7.5.0 Here

Accepts .hex (Intel HEX) and .bin (raw binary).

The tool should detect the device, and the progress bar will turn yellow or green as the files transfer. Wait for Completion flash loader tool 7.5.0

| Error Message | Likely Cause | Solution | |---------------|--------------|----------| | No response from the target | Wrong COM port or baud rate | Check Device Manager. Try different baud rates (115200, 57600, 9600). Ensure BOOT0=1. | | Unrecognized device | Bad wiring or incorrect voltage | Verify TX ↔ RX crossover. Ensure 3.3V logic (5V UART may damage chip). | | Timeout on ACK | Bootloader not active | Reset while holding BOOT0=1. Disable hardware flow control. | | Verify failed at address | Flash corruption or poor power | Retry after full erase. Add capacitors near power pins. | | Read-out protection enabled | RDP Level 1 active | Perform “Read Unprotect” (erases all data) then retry. | Accepts

You now see the main menu:

Practical tip: If flashing fails during erase/write, note the failing sector address—this can indicate bad flash or incorrect base address. Try different baud rates (115200, 57600, 9600)