The answer is to download and run firmware 2.6T
2.6T has a HDR timer that is user set to your times. Trouble is is that you will need to keep adjusting it month on month as dusk and Dawn changes depending on when you drive.
This is why I run firmware 1.03. That was the last version before they introduced HDR.
Viofo sent me a PM explaining that under 1.03 the older WDR was On or Off as per your menu setting but HDR, whilst the menu says On and Off is actually Low and High. HDR is known to introduce software induced motion blur but works well at night.
I've performed loads of testing with various firmware versions and 1.03 is the version that gives the sharpest daytime freeze frames.
There are 2 'Mod' versions built by Dashcamtalk member VVS but he is mainly concentrating on nighttime performance over daytime.
Let me know which versions you're interested in and I'll post links here. Firmware is easy to update and I'll post that later if required.
The proof of the pudding is sample screenshots. Both these shots are on the M4, same time of day and exactly the same 50mph.
Settings identical @
Resolution - 2560x1440
Bitrate - High
EV - 0.0
FPS - 30
Firmware 1.03 WDR Off:
Firmware 2.5 HDR Off: