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Questions still arise about this matter so here's a recap of what caching kexts and injecting kexts (through Clover) mean: 1/ Caching kexts: Kexts placed in /L/E and/or /S/L/E are cached in the kernel cache (or prelinked kernel) which aims to accelerate boot time. This is the natural and expected mode of operation of the OS. Cached kexts are subject to signature by Apple and must be set with the correct permissions (Cf. our FAQ topics on permissions). Cached kexts will be shown/listed/registered in System Info (ex-SysProfiler) -> Software -> Extensions. Caching kexts is the recommended scheme for all add-on kexts. /S/L/E is the location for Apple's own (i.e. vanilla) kexts. Ideally, this should be left untouched by Hackintoshers unless for very specific and rare reasons (eg: patched AppleHDA). /L/E is the location for 3rd party/add-on kexts. This is where all kexts we use for our Hackintoshes should go. Add-on kexts should only be placed in either folder, never in both. 2/ Injecting kexts through Clover: Injected kexts are not cached and will not be shown/listed/registered in System Info (ex-SysProfiler) -> Software -> Extensions. Injecting kexts results in a slightly slower boot than caching kexts (though many would arguably say it's hardly noticeable). Kexts injection operates according to Clover settings on the matter: If kext injection is set to Yes, kexts placed in E/C/k/O (or E/C/k/10.xx) will be injected. If kext injection is set to No, no injection takes place; obviously... If kext injection is set to Detect, kext injection operates according to the presence of FakeSMC in the kext cache (the kext having been properly installed in /L/E or /S/L/E). If present, no injection takes place, if absent, kext injection is performed. If kext injection is used, make sure the kexts aren't cached at the same time. Clover's E/C/k/O and E/C/k/10.xx are the locations for kexts that Clover injects at boot time: E/C/k/O is used to inject kexts regardless of the OS X/macOS version. E/C/k/10.xx are used to inject kexts for the given OS X/macOS version and therefore allow different kexts to be injected for different versions. Apart from the obvious requirement for fresh OS X/macOS installations (and/or updates), kext injection is very useful for recovery purposes (like booting without cache which ignores /L/E) or when testing kexts for instance; if a newly injected kexts causes issues (like a KP), it's very easy to remove/bypass it. On the other hand, kext injection is known to occasionally cause problem because it's not the natural way in which kexts should be loaded. Kext injection is basically a form of forced loading and, sometimes (though rare these days), it does not work. This is why -as stated on numerous occasions by Rehabman himself- Clover should really be set with kext injection in "Detect" mode and contain only the absolutely essential/minimum set of kexts required to boot the system. My own recommendation is to experiment with kexts through injection and, once kexts are validated, to cache them from /L/E. Google for this kext injection matter or consult the Clover wiki/InsanelyMac forum. It's all quite widely documented.

Thanks to the help of some threads/posts on this awesome forum, u/Human_Spirit on Reddit, among others who helped me out, I've successfully upgraded my E6330 to Mojave 10.14.4. Machine Specs: Latitude E6330 BIOS A11 Core i5 3320M Intel HD 4000 Clover R4920 Broadcom BCM94352HMB WiFi 867Mbps + BT 4.0 Card WD Blue 250GB SSD macOS Mojave 10.14.4 Working: WiFi, Bluetooth, iMessage/App Store, APFS, Keyboard, Trackpad, Backlight Control, Audio, HDMI, HWMonitor, Battery Indicator, Turbo Boost, Hardware Acceleration Issues: Touchpad (Alps V3) seems to be recognized as both a mouse and a trackpad. As such, it's impossible to use natural scrolling for the touchpad and reversed scrolling for a mouse (so the mouse functions the same as it does in Windows). If you reverse the mouse in preferences, it also reverses the scroll direction in the trackpad preferences. My EFI contents are attached. Decompress with 7 Zip. Dell_Latitude_E6330_EFI_Backup_Mojave.7z