Bootloader Burning Issue

Question

I have a custom CCA that utilizes an ATMEGA328 but with an external clock of 1MHz that I originally burned the ADABOOT bootloader on using an Arduino Nano. Everything worked as expected, only issue is I noticed the boot up time is a little long and after some research it seems that putting the Opti bootloader on may help with this.

Thus, I am trying to burn the opti bootloader onto my CCA, this time using an Elegoo Uno R3. I successfully was able to upload the ArduinoISP sketch onto the Uno but when I go to burn the bootloader I get the following error:

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:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"
     Using Port          : COM7
     Using Programmer       : stk500v1
     Overriding Baud Rate     : 19200
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x03
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x03
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x03
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x03
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x03
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x03
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x03
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x03
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x03
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x03
avrdude done. Thank you.
Error while burning bootloader.

I'm wondering if there is some sort of communication error since my custom CCA has the other bootloader on with different boards.txt settings than the default

f_cpu = 8000000L upload speed = 7200 low fuse = 0XCB high fuse = 0xDA extended fuse = 0xFD

When I perform the loopback test I don't get an echo on the serial monitor. I see both the "Rx" and "Tx" lights blink on the Uno, not sure if something is up there... Do you need to have a certain sketch uploaded for that to work?

Thanks, Pete

• Juraj: did you select the programmer in Tools menu to "Arduino as ISP"?