Pre Update Notes:
- This update may break some of your Mojave functions, like audio.
Make sure you backup first.
-
There are NO Nvidia Web drivers for Mojave as of this date/time. So, this update is for non Nvidia graphics card users.
- Make sure you use the latest versions of the Lilu.kext and WhateverGreen.kext. They will be in the
Downloads > Kexts area. AppleALC.kext is located
here.
Please post help requests in the Mojave Desktop Support Forum section (not in this thread).
Here's the step by step way to update:
Backup your current installation using Carbon Copy Cloner or SuperDuper;

Update to the latest Clover:
Downloads > Clover Builds.

Download the Mojave 10.14.4 Update or Combo Update in Post #1 or the update from Apple's Mac App Store and run it - the updater will reboot upon completion.
...
I had a different experience, and a few things didn't go well, but, since I heeded your primary statement [
BACK UP!] all ended well.
I first tried updating to the latest Clover build (here) but it was bugging out and the install failed [>once], and I also [first] tried to upgrade directly from the [upgrade] preference panel--no joy. After a few mishaps, I just did a retroactive backup to a relatively recent snapshot and started over...using the older Unibeast USB I had used for 10.14.3.
I ended up going to the Clover site (
https://sourceforge.net/projects/cloverefiboot/ ) and got the most recent stable build at that time (4910), and it installed successfully. Then, after restart, I used the link provided here to download the [basic] update (not the combo), and installed that without a hitch.
Upgrade didn't take long, and after a couple restarts, in which the correct drive/partition was automatically chosen through the update software process (unlike some in recent past upgrades), so I booted into 14.4 -- woohoo!
Everything seemed to work OK except the audio, which was expected, based upon experiences.
Using current MultiBeast, I then installed driver for audio (ALC and 3-port option), and my HDMI audio was all set for selection and setup using Audio MIDI Setup, after restart. Although I haven't checked EVERYTHING exhaustively, everything seemd to work well, and I have sleep/wake, etc., sound and graphics seem great etc.
Success! Thanks, to yall and the resources here at TonyMac

Thumbs up doods!