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MD398 Reverse Engineering
Resources for the Tytera (TYT) MD398 (aka Radioddity GD-55).
General Information
The radio uses a vastly different design than the familiar MD380/MD390. It uses the AT1864S radio SoC. It is a familiar chip used in many Wouxun/Baofeng model, however to the key difference that this newer S series provides an IQ baseband interface.
It appears to be using an integrated ARM M7 built into the HR-C3000.
The programming cable is actually a common USB to TTL serial interface (not an actual USB device). It's still not impossible the radio could appear as a DFU usb device for upgrades however.
Boot Modes
Different boot modes seem to be available:
| PTT | TOP SIDE BUTTON | BOTTOM SIDE BUTTON | EMERGENCY BUTTON | Function |
|---|---|---|---|---|
| X | X | Flip + Mirror screen | ||
| X | X | ??? Black screen no chime, upgrade mode? | ||
| X | X | GPS Test mode |