well... sending commands via serial cable in order to reset firmware is not what I would call "simple"...
It implies that you have a second (working) computer, a serial cable and the suitable software (configured properly) to be able to reset the firmware...
"a0;L;
w38806040;+;w64848000;+;w3ca0f100;+;w60a50c78;+; w7c000278;+;w7c802d2c;+;w7c0006ac;+;w3ca0f100;+; w38600014;+;w98650c7c;+;w7c0006ac;+;w3c80fff1;+; w386000aa;+;w98645555;+;w7c0006ac;+;w38a00055;+; w98a42aaa;+;w7c0006ac;+;w38c00080;+;w98c45555;+; w7c0006ac;+;w98645555;+;w7c0006ac;+;w98a42aaa;+; w7c0006ac;+;w38e00030;+;w98e40000;+;w42800000;
a0;g;"

Regards,
Leo.