I have a similar problem on Mojave. Tried updating clover to 5122, but to no avail.
After starting the update, the black screen shows some progress, then reboots.
After booting into "Install macOS", the pink lines appear (they don't on the "original" 10.14.6) and the status bar moves ever so slowly forward, but after about 10-15 seconds, all disk activity stops. At about 3/4, the status bar also stops, and after 1-2 minutes, the computer reboots and repeats...
Anything I could try and change in clover settings?
Loaded drivers in clover are ApfsDriverLoader, AptioMemoryFix, AudioDxe, DataHubDxe, FSInject, NvmExpressDxe, SMCHelper, VBoxHfs.
I have some kexts, which I put in HD/Library/Extensions on recommendation from this forum after switching to the 5xxx clover. These are - in addition to macOS' own kexts - AppleALC, IntelMausiEthernet, Lilu, VirtualSMC, WhateverGreen and (possibly) SMC{BatteryManager|LightSensor|Processor|SuperIO}, all current as of December 19.
Any hints or tips would be appreciated.