I am building my own quadcopter and after soldering most connections to my arduino pro mini I can't upload any code to it via ftdi. It worked just fine before soldering. I have removed all connections that weren't open (everything except headers) but still cant upload code. I have tested connections and there weren't any shorts. I am also sure I selected the right board and the right port.
I have searched the web but I can't find any cases which have the same exact error (resp=0xc4). Has anyone got an idea what's wrong?
Edit: I resoldered all pins on the arduino and it works just fine now