Incidentally, be VERY careful not to use a firmware with an 'E' at the end of it. Their firmware update instructions are confusing, to say the least, and those versions available on their site with the E are for European models not sold in the USA, and will brick your transmitter. I just found this out the hard way, and had to send mine in to get flashed in Rio Rancho. In fact, version 1.52 is current, and is not available on the site. You can get them to email it to you, if you're the owner of a transmitter with a serial number in the right series.