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# MD398 Reverse Engineering
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Resources for the Tytera (TYT) MD398 (aka Radioddity GD-55).
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## General Information
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The programming cable is actually a common USB to TTL serial interface (**not** an actual USB device).
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It's still not impossible the radio could appear as a DFU usb device for uprgades however.
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## Boot Modes
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Different boot modes seem to be available:
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| PTT | TOP SIDE BUTTON | BOTTOM SIDE BUTTON | EMERGENCY BUTTON | Function |
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|:---:|:---------------:|:------------------:|:----------------:| -------- |
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| *X* | | *X* | | Flip + Mirror screen |
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| | *X* | *X* | | ??? Black screen no chime, upgrade mode? |
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| | | *X* | *X* | GPS Test mode |
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