Hold the SETUP button for about 10 seconds until a secret menu appears. Select "Version Info".
Version 6270 was manufactured for units starting around CW45/13 (November 2013) that typically feature an SSD instead of a standard HDD and a newer GPS chip.
Firmware 6270 is a software update designed specifically for RNS 510 units (manufactured from 2010 onwards, with a red display menu for HW version). It sits between the older 5xxx series and the final 6xxx series updates.
Before we dive into the download process, it's essential to note that you should only download firmware updates from trusted sources to avoid any potential risks. Here are the steps to download RNS 510 firmware 6270: