Newer TC-508 radios often use the RDA chipset. For these, ensure you use software versions like V5.05.01 or V5.06.01 specifically labeled for "Narrow Band" or "RDA".
While "official free download" is a contradiction, there are ways to obtain the software. Hyt Tc-508 Programming Software Free Download
For business-critical operations, investing in a legitimate copy from a Hytera dealer is the safest, most reliable long-term solution. However, for hobbyists and small teams on a budget, the method outlined above has been used successfully by thousands of radio enthusiasts worldwide. Newer TC-508 radios often use the RDA chipset
Exploring Legal Alternatives and Ethical Practices For business-critical operations
Hytera TC 508 Programming Software v5. 06.01. Логин Пароль Регистрация Radioscanner.Ru Hytera Programming Software and Licenses - Atlantic Radio
If you own a legitimate HYT TC-508 radio, here is the proper way to obtain the programming software: