Error occurred while loading sketch

Hi I'm new to Arduino and have been trying to upload a bootloader for a 3D printer I have followed the steps set out on Youtube the error message below is what I get. Can anybody help please? The guy on Youtube was using a Sanguino board.
Ender 5 bootloader and Marlin update - YouTube.

Arduino: 1.8.10 (Windows 10), Board: "ATmega328, Yes (UART0), EEPROM retained, 328P / 328PA, BOD 2.7V, LTO disabled, Internal 8 MHz"

Sketch uses 5090 bytes (15%) of program storage space. Maximum is 32256 bytes.
Global variables use 484 bytes (23%) of dynamic memory, leaving 1564 bytes for local variables. Maximum is 2048 bytes.
C:\Users\Admin\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude -CC:\Users\Admin\AppData\Local\Arduino15\packages\MiniCore\hardware\avr\2.0.9/avrdude.conf -v -patmega328p -carduino -PCOM4 -b38400 -D -Uflash:w:C:\Users\Admin\AppData\Local\Temp\arduino_build_60884/ArduinoISP.ino.hex:i

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 "C:\Users\Admin\AppData\Local\Arduino15\packages\MiniCore\hardware\avr\2.0.9/avrdude.conf"

Using Port : COM4
Using Programmer : arduino
Overriding Baud Rate : 38400
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x66
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x66
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x66
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x66
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xe0
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x66
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xe0

avrdude done. Thank you.

An error occurred while uploading the sketch

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Please post a link to the timestamp at the specific step of the video you're at when you get this error.

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