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xSmurf
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8 years ago | |
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| datasheets | 8 years ago | |
| teardown | 8 years ago | |
| README.md | 8 years ago | |
README.md
MD398 Reverse Engineering
Resources for the Tytera (TYT) MD398 (aka Radioddity GD-55).
General Information
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 uprgades 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 |