If you use more recent versions of the Raspberry Pi suite, this text may be found in /boot/config.txt
# do not modify this file as it will be overwritten on upgrade.
# create and/or modify usercfg.txt instead.
# https://www.raspberrypi.com/documentation/computers/config_txt.html
#
If you see this, follow the instructions and overwrite /boot/usercfg.txt instead to avoid losing your changes.