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sudo apt upgrade
sudo rpi-eeprom-update -a
If a firmware update is available you will be prompted to install it and your Raspberry Pi will reboot. More information about updating the firmware on your Raspberry Pi is available in the [https://www.raspberrypi.com/documentation/computers/raspberry-pi-5.html#updating-your-firmware official documentation].
* Use tool '''raspi-config''' to update
sudo raspi-config
Then select Advanced Opitions => A5 Bootloader Version => E1 Latest）
Then restart and the firmware will be updated (requires Internet access).
'''3. Update to specified version'''(Not recommended)
At some point, you may need to update to a specified version (you almost never need to use it now). You can refer to the following command. Visit [https://github.com/timg236/rpi-eeprom/tree/master/firmware-2712/default this link] to view firmware version history.