Today I tried to load an update to my Pro-197 using Win500. When it got to about 14% it displayed a CheckSum Failure and then cleared memory. I was able to load the p500 file on the second attempt seeing memory was cleared out from the error. This is the first time seeing this error. It only seems to happen when I make changes to my file and upload it. If I don't make any changes, I can write to the radio all day. Strange