MPROG 3.5 remains a testament to FTDI’s early commitment to developer freedom. While newer tools exist, this legacy application continues to run millions of devices in industrial and hobbyist environments worldwide. By following this guide, you can safely perform your and customize your FTDI devices with confidence.
As of 2025, the direct path often redirects. If the legacy page is hard to find, use the official FTDI knowledge base article "Where can I find older versions of MPROG?" They will provide a checksum-verified link. ftdi mprog 3.5 download
Although MPROG 3.5 was written for Windows XP, it works on modern Windows versions with a few tweaks. MPROG 3
Plug in your FT232R or FT245R-based board. Windows should chime. Open MPROG 3.5. As of 2025, the direct path often redirects
A fascinating driver for downloading MPROG 3.5 today is When Windows marks an FTDI chip with error code 43 (driver intentionally loaded but failed), only MPROG 3.5 can sometimes brute-force a low-level EEPROM erase using an external EEPROM programmer bypass – because later FTDI tools refuse to even enumerate the device.
Once you have completed the and installation, here is how to use the tool effectively.