Arduino Mega2560 Firmware update

Hi all,
I have planned to use Arduino Mega2560 for IoT project. So i wanted to know whether we can update firmware for Arduino Mega2560 via OTA.

Thank you.

By firmware do you mean the bootloader, or do you mean the loaded sketch?

Thank you ChrisTenone for the reply.

It is Loaded sketch so that if we have to make some changes according to the client.

No. You can't.