прошивка anet v 1.5

Пытаюсь прошить марлин на anet a8 но выходит вот такая ошибка

avrdude: Version 6.3, compiled on Jan 17 2017 at 12:00:53

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

Copyright (c) 2007-2014 Joerg Wunsch

System wide configuration file is 'E:3d printermarlinarduino-1.8.4hardware oolsavr/etc/avrdude.conf'

Using Port : COM20

Using Programmer : arduino

Overriding Baud Rate : 57600

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xd6

avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x6f

avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x80

avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xbf

avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xae

avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xd6

avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x02

avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x21

avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xcc

avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xd6

avrdude done. Thank you.

Подскажите пожалуйста что я делаю не так.

Прошивал вот по этой статье https://3dtoday.ru/blogs/komandr/anet-a8-and-auto-calibration-or-manual-calibration-table-p1-migration-/ Плата Anet v 1.5