I ended up using a different USB to serial adapter and re-downloaded the files. Works like a champ now! Dave, W0RU K3 #5253 -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Error-loading-DSP1-firmware-tp7117360p7142759.html Sent from the Elecraft mailing list archive at Nabble.com.