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TYT/Tytera MD398 Reverse Engineering
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Added official brochure... 		10 years ago
datasheets Added official brochure... 10 years ago
teardown Renames... 10 years ago
README.md Added info about programming 10 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 USBN 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