Uploading "not in sync"/ booloader seems broken

Hey everyone,

somethink went wrong with my 1 day old brittle.

It´s my first robot and i´m fairly new to the topic at all.

I tried to upload my first sketch step by step with this tutorial: https://docs.petoi.com/arduino-ide/upload-sketch-for-nyboard

Everything works fine until step 10 - i uploaded the sketch with the now again uncommented "#define MAIN_SKETCH" - nothing happend after that (the upload dont´t throw any failure message to me).

The tutorial says:

"Open the serial monitor. When the serial monitor prints "Ready!", the robot is ready to take your next instructions."

but there was nothing - completly empty serial monitor since then, no matter what i do.

Every next try to upload a sketch brings the "not in sync error" message, so i tried to repair the Bootloader with this Tutorial:

https://docs.petoi.com/technical-support/burn-bootloader-for-nyboard

I have an additional Arduino Uno R3 and followed the instructions step by step - everything works fine until i clicked "Burnt Bootloader".

The following error message appeared and i am completely lost with the "Failed chip erase" message at the bottom.

"/Users/stefankruppa/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/bin/avrdude" "-C/Users/stefankruppa/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf" -v -patmega328p -cstk500v1 -P/dev/cu.usbmodem1101 -b19200 -e -Ulock:w:0x3F:m -Uefuse:w:0xFD:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m

avrdude: Version 6.3-20190619

Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/

Copyright (c) 2007-2014 Joerg Wunsch

System wide configuration file is "/Users/stefankruppa/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf"

User configuration file is "/Users/stefankruppa/.avrduderc"

User configuration file does not exist or is not a regular file, skipping

Using Port : /dev/cu.usbmodem1101

Using Programmer : stk500v1

Overriding Baud Rate : 19200

AVR Part : ATmega328P

Chip Erase delay : 9000 us

PAGEL : PD7

BS2 : PC2

RESET disposition : dedicated

RETRY pulse : SCK

serial program mode : yes

parallel program mode : yes

Timeout : 200

StabDelay : 100

CmdexeDelay : 25

SyncLoops : 32

ByteDelay : 0

PollIndex : 3

PollValue : 0x53

Memory Detail :

Block Poll Page Polled

Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack

----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------

eeprom 65 20 4 0 no 1024 4 0 3600 3600 0xff 0xff

flash 65 6 128 0 yes 32768 128 256 4500 4500 0xff 0xff

lfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00

hfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00

efuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00

lock 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00

calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00

signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00

Programmer Type : STK500

Description : Atmel STK500 Version 1.x firmware

avrdude: stk500_getparm(): (a) protocol error, expect=0x14, resp=0x14

avrdude: stk500_getparm(): (a) protocol error, expect=0x14, resp=0x02

avrdude: stk500_getparm(): (a) protocol error, expect=0x14, resp=0x10

Hardware Version: 35370299

Firmware Version: 140626928.3

Topcard : STK502

Vtarget : 1.8 V

Varef : 0.0 V

Oscillator : Off

SCK period : 0.1 us

avrdude: stk500_initialize(): (b) protocol error, expect=0x10, resp=0x01

avrdude: initialization failed, rc=-1

Double check connections and try again, or use -F to override

this check.

avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x10

avrdude done. Thank you.

Failed chip erase: upload error: exit status 1

Hope anyone has an idea what i can try next, i´m a bit frustrated right now cause my Bittle seems a bit "dead", LEDs a lighting but no beep sound at power on and no movement :(

(I´m on a Mac Book Pro M1, in case this is important)

Greetings!

Stefan