You can easily check what firmware version your Dash Cam currently has on the Dash Cam itself.

1) Turn the Dash Cam on
2) Stop it recording (by pressing the red square in the bottom left of the screen)
3) Go into Settings (the settings icon will show in the top left of the screen once a recording is stopped)
4) Go into Setup settings
5) Scroll across to ‘System Info’
6) Look at the Firmware number RXX.XX.

Then compare it to the Firmware number stated above. 

This is symptomatic of an SD card failure.
Please check that your card is not larger than 128GB and has a minimum U1 class.
Please remove the SD card, then press the reset button on the underside of the Dash Cam. Then, without the SD card inserted, please turn on the Camera. Does it now start normally? If so, then the SD card has either failed due to lack of formatting or is not compatible for Dash Cam usage

If the Screen Saver is enabled on the camera, the camera's screen will turn off after 30 seconds of recording. The camera is still on and recording (indicated by the flashing red LED), it's just the screen that's been turned off (black). This is used by certain drivers to prevent distraction.

1) Turn the Dash Cam on
2) Stop it recording (by pressing the red circle button)
3) Go into Settings by pressing the MENU button twice.
4) Scroll down to ‘Screen Saver’
5) Enable/ disable the Screen Saver here

There's also a setting available called 'Speed Display'. This will allow the camera to act as above with Screen Saver, but instead of just a black screen, the vehicle's current speed will be displayed instead.

1) Turn the Dash Cam on
2) Stop it recording (by pressing the red circle button)
3) Go into Settings by pressing the MENU button twice.
4) Scroll down to ‘Screen Saver’
5) Select the Speed Display setting.
6) Enable/ disable the Speed Display here.

https://nextbase.co.uk/content/manuals/222g-firmware-update-instructions-at-rev1.pdf