In order to download and install new firmware do I need only
pin 2 (RXD), Pin 3 (TXD), and Pin 5 (Common or SER C) connected in my serial 
interface cable from the computer?

Yes, only these.

The schematic shows, in addition to the above, some handshake connections:
Pin 7 (RTS) and Pin 4 (DTR).

These are for KEY and PTT inputs supported by some programs. They are not used in firmware downloading.

73,

Lyle kK7P

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