LiveStream Broadcaster notes:

Reversing document from overseas -- incorrect on pinout!

From DB1:
GND
Reset?
NC
RX
TX
NC

- Use 5v Serial dongle


Teradek firmware image has different root password in it.

Based on docs of MG3500 SDK, U key aborts startup for update, and most importantly
has a shell feature which might allow access to boot single user mode or fsck the filesystem.

The kernel panic points to reading the NAND, which means there could be address bus or data 
bus issues -- or a failed NAND flash IC.