In this post, you will find link to download Nokia 6 Flash file free download version 619B-0-00WW-B02_OST (Stock Firmware ROM). The flash file comes in a zip package that contains the flash file
The firmware will assist you in upgrade, Downgrade, re-Install and restoring Flash files on your mobile device.
Stock Firmware ROM (Flash File) helps you repair mobile devices
Nokia 6 Flash file free download version 619B-0-00WW-B02_OST Link