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# MD398 Reverse Engineering
Resources for the Tytera (TYT) MD398 (aka Radioddity GD-55).
## 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 |