Safemode: lfuse changed! Was ff, and is now 0

Other Hardware 3rd Party Boards
1

I have been programming atmega2560(custom pcb) via ISP. And i have been programming via ISP for a month, this works fine, suddenly I got this and couldnt program anymore.

avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x3a37
0x00 != 0x01
avrdude: verification error; content mismatch
avrdude: safemode: lfuse changed! Was ff, and is now 0

Programmer : Atmega2560 (Arduino mega)
Target : Custom pcb Atmega2560
Ide : VScode

2

You should post the content of the "Custom pcb Atmega2560" section of your boards.txt!

3

As above and the compiler is complaining about the fuse settings

4

[env:program_via_ArduinoISP]
platform = atmelavr
framework = arduino
upload_protocol = custom
board = megaatmega2560
upload_speed = 19200
upload_port=COM13
monitor_speed = 115200
upload_flags =
-C
; use "tool-avrdude-megaavr" for the atmelmegaavr platform
${platformio.packages_dir}/tool-avrdude/avrdude.conf
-p
$BOARD_MCU
-P
$UPLOAD_PORT
-b
$UPLOAD_SPEED
-c
stk500v1
upload_command = avrdude $UPLOAD_FLAGS -U flash:w:$SOURCE:i
lib_deps =
tomstewart89/Callback@^1.1
bblanchon/ArduinoJson@^6.19.4

5

That doesn't look like a boards.txt from the Arduino IDE. It looks like some file from the PlatformIO system. Ask for help on their boards please.

A few hints nevertheless: At least the Arduino IDE uses stk500v2 for the Mega2560 and an upload speed of 115200 baud.

6

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