Watching a movie a couple of days ago, my HK AVR 247 went into protect modes during loud scenes. It would come on again, but again cut out during a loud scene.
So I started researching what might be going on, and realized that HK has published a firmware update here: http://www.harmankardon.com/EN-US/Pr...px?PID=AVR+247 in the product updates section.
I verified and found that I do not have the latest firmware.
Later in the day, I realized that the protect mode was caused by a short on one of the surround speakers. I guess if something loud came on that channel, it would go into protect.
Anyway, I'd still like to perform the software update.
Apparently, I need a USB to RS232 cable. Does anybody have a recommendation on which cable will work? There are plenty of cheap cables on eBay - as low as $5... like this one: http://cgi.ebay.com/USB-RS232-FEMALE...item5189951398
Has anybody done this upgrade? Any advice?