I just got my TRX 2 yesterday and set it all up. It wouldn't let me upload the SD card and put it back into the scanner with giving me the waiting for main unit message. I took out the SD card and put it back into my laptop to read and eject. Then I put it back into the TRX 2 and bam it worked ok. The last two times I decided to unplug the unit and move it, when I power it back up and would give me an error, yes I would power it down properly. Last error code is 03-01, does anyone think I just received a bad SD card? When I do get it going it works fine.