As the progress bar hit 100%, the radio emitted a sharp, clear beep. Elias keyed the mic. "This is Unit 1, testing signal strength."
This is a reputable source for legacy radio software. You can find the HYT TC-508 v. 1.01.09 (often for older 16-channel analog models) or HYT HT-508 - TC508E v. 2.02.10 . Hyt Tc-508 Programming Software Free Download
The standard software used for this model is HT508 CPS (Customer Programming Software). As the progress bar hit 100%, the radio