Problem Programming a Arduino ATmega168 16MHz 5Z Pro Mini.

Using Arduino IDE 1.x
1

Hi all,

I can program a ATmega168 16MHz 5Z once and the downloaded LED flashing program works.

But when I go to program it again, it will not load the new program. I get this error:

attempt 1 of 10: not in sync: resp=0x47 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync()

Since it was programmed once. I would have thought that the IDE settings and communication port are correct.

I have now tried to program two ATmega168 Pro Mini devices, and the same happens to both modules.

Are the ATmega168 16MHz 5Z (or is it 5V?) a once program only device?

Or is there a Bug somewhere?

Thanks for your help.