How To Install Xprog 555 On Windows 10 Better May 2026

Change it to: Signature = "$Windows NT$" (remove the semicolon).

If you are an automotive locksmith, an ECU tuning enthusiast, or a repair technician, you know the Xprog 550 (often called Xprog 555) is a legendary tool for reading/writing microcontrollers (MCUs) like Motorola HC(S)12, ST, and Renesas. However, there is a notorious problem: It was designed for Windows XP. how to install xprog 555 on windows 10 better

Find the line: ;Signature = "$Windows NT$" Change it to: Signature = "$Windows NT$" (remove