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I think this webpage may solve your problem. This extract suggests that the file uou need is already on your computer. "
Then locate the hex file for the ATmega into Arduino’s installed directory ARDUINO -> HARDWARE -> ARDUINO -> FIRMWARES -> atmegaxxU2 and then select the proper HEX file for the arduino.
(Atmega HEX is much bigger for the R3 Uno, so cannot load onto the 8u chip. This is why the 16u replaced the chip)."
I had a look on my computer and found that there was an extra level in the directory path.
C:\Program Files (x86)\Arduino\hardware\arduino\avr\firmwares\atmegaxxu2
Les.
Then locate the hex file for the ATmega into Arduino’s installed directory ARDUINO -> HARDWARE -> ARDUINO -> FIRMWARES -> atmegaxxU2 and then select the proper HEX file for the arduino.
(Atmega HEX is much bigger for the R3 Uno, so cannot load onto the 8u chip. This is why the 16u replaced the chip)."
I had a look on my computer and found that there was an extra level in the directory path.
C:\Program Files (x86)\Arduino\hardware\arduino\avr\firmwares\atmegaxxu2
Les.
