Is flash ROM also change CDA

I am a newbie here, is flashing a new ROM will also change the CDA?

no. the CDA remains the same. but if u are gonna customize it with another CDA then it will change yes. what mobile phone are you talking about??

Please read the guides and tutorials, also definitions may help.

What model do you have? See what characteristics it has by posting an identify log.

If you want to flash a new firmware, you must use Main + FS + CDA that goes according to the FS.