CHIRP software is a popular open-source programming tool used for configuring and managing various models of amateur radios. It allows radio enthusiasts to program frequencies, settings, and other parameters of their radios via a computer interface. With CHIRP, users can easily create, edit, and organize radio configurations, and then upload them to compatible radios.
Once you have the correct cable and driver installed being a Prolific or FTDI Chipset, you will need to install CHIRP software that can be download for free here.
When programming this Radio with Chirp you will need to select this radio: UV-17Pro as the model UV-21 GPS isn't listed.
BaoFeng/QYT Programming Cable Driver (FTDI)
File: CDM v2.12.36.4 WHQL Certified.zip
a8654caa76151e92161e2767294337039189ac3bab3a794dbac791cd1901172b
BaoFeng/QYT Programming Cable Driver (Prolific)
File: P3200.exe
807b8a5a61c7d30149d65f0862eef51fc86e322b96a956ba04ae30fec266632e
BaoFeng/QYT Programming Cable Driver (WCH CH340)
File: CH341SER.ZIP
0b1da457085bdf981ca24de2ab72a24b6460b52375ac886abff0dbec79d360ec