Hi all, I have made a custom board using ATMEGA32u4 and everything works perfect. Recently, due to chip shortage and the availability of ATMEGA32u4-RC, I bought a few to put in my boards as a replacement. The problem is, after programming it for the first time, it doesn't program anymore. it says …

As above, change the fuse settings to use the external oscillator: [Capture]

ATMEGA32u4 RC variant programming issue

jremington November 8, 2021, 5:42pm 6

Depends on your system. Search for "arduino set AVR fuses" for many discussions.

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