What firmware is on Ender 3 V2?

The Ender 3 V2 comes with stock Creality firmware, you can find all versions in Creality Cloud firmware page.

Should I update my Ender 3 firmware?

In most cases it is a good idea to update your Ender 3 V2 firmware. Newer versions of firmware often contain bug fixes, improved features, and the ability to support new hardware upgrades. For example, upgrading your Ender 3 V2 firmware could allow you to take advantage of new features such as auto-leveling, thermal runaway protection, or even silent printing. Updating your firmware can also help you to get the most out of your Ender 3 V2 as it will increase its performance, reliability, and stability. Additionally, updating your firmware may also help to extend the life of your printer by addressing any issues that have been identified in older versions.