I am trying to upload (any) sketch to a MEGA2560 board that I have, but consistently get a: avrdude: verification error, first mismatch at byte 0x004c 0xfb! = 0xeb avrdude: verification error; content mismatch [image] This error occurs for any sketch that I wish to upload. Following Nick Gammon…

Bootloader Problem?

mrburnette November 10, 2013, 3:33pm 2

My suspections are the 8U2 (or similar) that is the USB to serial (LUFA) processor. Does the board enumerate properly when the USB is inserted?

Ray

Topic		Replies	Views
bootloader error Programming Questions	18	6004	May 5, 2021
Mega2560 sketch upload problem Microcontrollers	3	612	May 6, 2021
Uploading to ATMEGA 2560 Avrdude, stk500, Bootloader issues	8	491	March 19, 2023
Why, oh why? verification error, first mismatch at byte 0x00c5 0x90 != 0x94 Microcontrollers	20	2240	May 6, 2021
ATMEGA2560 bootloading problem Microcontrollers	3	1977	May 6, 2021