Finally! The focus assist on the SmallHD DP4 caused the screen to go fairly dark, and although you could see the focus assist lines, you couldn't really see what you were focusing on! They made the feature much better in the DP6 through a recent firmware update, and now they've made it available for the smaller DP4. Information below, but as usual check with the SmallHD website for any known issues about upgrading your firmware.

SmallHD is happy to announce the release of DP4 Firmware Update V1.2.
This is our latest effort to add more value to your investment and provide the tools to help you do your job even better.

You can find the Firmware Update Instructions for the DP4 here:
https://www.smallhd.com/s.nl/ctype.KB/it.I/id.8261/KB.1407/.f?category=48

DP4 Firmware V1.2:
https://www.smallhd.com/DP4_Firmware/SMALLHD_DP4_OSV1_2.bin

New Features and Fixes
* Focus Assist + has been added to replace Focus Assist (Menu>Advanced>Focus Assist) While the old Focus Assist worked well to achieve critical focus, it darkened the image beyond comfortable viewing levels. The new “Focus Assist+” enhances the in-focus areas even more while retaining the image much more than the original Focus Assist. This is an excellent new tool to help you achieve accurate focus quickly and efficiently.
* Improved accuracy of the Nikon Preset (Preset>N DSLR REC) Enjoy the benefits of a full screen image while recording with your Nikon camera.
* Custom Scales will now be saved after using 1:1 Mapping (Menu>Advanced>Custom Scale. Menu>Advanced>1:1 Mapping) Use 1:1 Mapping confidently knowing that the Custom Scale settings that you have set will still be there where you are done.
* Menu Flip function fixed (Menu>System>Menu Flip)