@bouvin said in Cores3 uiflow: I, too, have received a CoreS3. I have flashed many Core2s before, but this does not seem to work? From the M5Burner application, I can select the Alpha13 UIFlow 2.0 firmware, successfully burn it to the CoreS3, but it starts up regardless in the demo application…. Are others seeing the same? The S3 generation is flashed differently to previous generations, you have to manually put the S3 devices into boot mode by holding down the reset button to get a green light to get them to flash. I have a video about it going live on Saturday on Youtube.