Hi, I've Arduino Uno R3 and I never had any problems working with it, now I want to build standalone projects, everything is fine with the ATMEGA included on my Arduino, but I bought 2x ATMEGA328P-PU from ebay (this one), which already has optiboot bootloader installed (supposedly), and there's no way to get it work. I tried placing these atmegas on arduino, connecting by serial, burning bootloader by myself... but nothing works.
I tried with all these schemes, I watched some videos... definitely no way... I'm lost, so if someone could help me it would be appreciated.
Thanks, best regards.