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Hi I have the exact same problem.
I have bought new 3 pcs. Controllino Mini and 1 of them are giving this error all the time (se error below) and the others are working as expected.
So what can I do to fix the problem? Or is the one Controllino defective and needs to be replaced?
Code:Sketch uses 2236 bytes (6%) of program storage space. Maximum is 32256 bytes.
Global variables use 186 bytes (9%) of dynamic memory, leaving 1862 bytes for local variables. Maximum is 2048 bytes.
avrdude: verification error, first mismatch at byte 0x0042
0xff != 0xb2
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch