Hello, everyone. I thought I'd post this in case it could ever be useful to anyone else. Wanting to try out my newly-soldered Peggy 2 (serial version), I tried uploading one of the sample programs, using the Arduino application. I then got this lovely error message:

avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

I managed to solve this problem, but only by doing the following TWO things, gleaned from various forums:
1. Upgrading my FTDI (USB COM port) driver: see http://www.ftdichip.com/Drivers/VCP.htm
2. Checking the "Set RTS on close" option for the USB Serial port (Port settings/Advanced)
Either one by itself isn't enough, I needed to do both. Oh, and I'm using the Arduino application ver. 18, running on Windows 7.

Sorry if this is obvious to everyone but me.

Mark

Obvious or not, it bears repeating.