I destroyed my Arduino Uno Wifi chip. I plugged in the 9V/2A power supply and I connected the Vin and 5V pin instead of grnd.... SMOKE.
I replaced the ATMEGA328P-PU chip with the chip from the Arduino Duemilanove board and my question now is how can i flash the old Duemilanove chip with Arduino Uno Wifi loader?
You will need an ISP(In System Programmer). If you have another Arduino you can use it as "Arduino as ISP" using the File > Examples > 11.ArduinoISP sketch. Otherwise you will need to buy an ISP. I highly recommend the 6 pin version of the USBasp, which you can get on eBay for less than $3 USD with free shipping from China. There is also a 10 pin version, which will work fine but you also need to buy the 10 pin to 6 pin adapter.