In this post, you will find link to download Nokia 6 TA-1021 Flash File (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 TA-1021 Flash file free download version MSM8937 28122017 7.1.1 Link