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As @arsradu suggested, just update to latest Clover and update the kexts to the latest. If you have 3rd party kexts in /L/E make sure to update those as well, repair permission and rebuild cache. See if it still boots. If no issue, then continue upgrading. For sure you'll need a minimum of Clover v5107 to boot 10.15.4. I would recommend just upgrading to the latest v5118 at the time of writing this.

Where are you updating from? In theory, if everything is correctly configured, and if you're not upgrading from Yosemite to Catalina or some really old version of MacOS, then yeah...it should work pretty smoothly. What I would recommend is just making sure the following things are up to date: 1. Clover (here's the official place to download it from) 2. drivers and kexts (you can use Clover Configurator to update those) Also, before anything, copy your existing EFI folder to the EFI partition of a USB drive for safe keeping. This way, if anything happens with the Clover update, you still have a backup. When you're done updating Clover and kexts, before starting the upgrade to Catalina, try to see if you can still boot your current installation with updated files. If everything ok, download the update directly from your current version of MacOS, or make a bootable USB drive with Catalina on it and try to install it. In case the updated EFI folder is still ok, you can add that to your USB, as well.

Hello! Installed Catalina 10.15.4 on my Latitude 5400 i7-8665U with UHD 620 Graphics after installation trackpad and right/left click are working fine. Installed clover and copied EFI then reboot, after reboot trackpad is not working. and I've also got a DW1560 wifi adapter, WiFi is working but I can't make the BT working. copied below kexts to /L/E using hackintool BrcmBluetoothInjector.kext BrcmFirmwareRepo.kext BrcmPatchRAM3.kext Please help. EFI folder attached. EFI.zip

Generate P States and Generate C States are settings applicable to old C2D/C2Q/1st gen Core platforms only. They do not apply to Sandy Bridge platforms and beyond, including Broadwell platforms such as yours. In fact, if you call on these, you may find your CPU switching only between that low frequency you reported and the highest nominal frequency; all without Turbo boost and intermediate frequencies, which means CPU inefficiency and hammered performance. In order to enjoy proper CPU power management on your Broadwell Latitude laptops: either you apply/select/set/tick PluginType option in Clover ACPI section to which you may add Plugin Type=1. or you drop SSDT tables with ids CpuPm + Cpu0Ist in Clover ACPI section and generate your CPU-specific power management SSDT with Pike R Alpha's good old SSDT generator script; you'll then place the generated SSDT table in E/C/ACPI/patched folder. E7250/E7450 are fitted with low-power CPUs such as i5-5300U/i7-5600U and you should expect idle frequencies of 800MHz. If Intel datasheets do indeed indicate LFM frequencies as low as 500 or 600MHz, I'm pretty sure these are reserved for the programmable TDP-down/7.5W reduced power mode. In fact, if you download and install Pike R Alpha's complete tool and consult the data files for the Broadwell CPUs, you'll see this: # Broadwell mobile processor data. # gMobileBroadwellCPUList=( # # 5th generation Intel® Core™ i7 Processors (socket FCBGA1164) # i7-5950HQ,47,500,2900,3800,4,8 i7-5850HQ,47,500,2700,3600,4,8 i7-5750HQ,47,500,2500,3400,4,8 i7-5700HQ,47,500,2700,3500,4,8 # # 5th generation Intel® Core™ i7 Processors (socket FCBGA1168) # i7-5650U,15,800,2200,3100,2,4 i7-5600U,15,800,2600,3200,2,4 i7-5557U,28,800,3100,3400,2,4 i7-5550U,15,800,2000,3000,2,4 i7-5500U,15,800,2400,3000,2,4 # # 5th generation Intel® Core™ i5 Processors (socket FCBGA1168) # i5-5350U,15,800,1800,2900,4,4 i5-5300U,15,800,2300,2900,2,4 i5-5287U,28,800,2900,2900,2,4 i5-5257U,28,800,2700,3100,2,4 i5-5250U,15,800,1600,2700,2,4 i5-5200U,15,800,2200,2700,2,4 # # 5th generation Intel® Core™ i5 Processors (socket FCBGA1364) # i5-5350H,47,800,3100,3500,2,4 # # 5th generation Intel® Core™ i3 Processors (socket FCBGA1168) # i3-5157U,28,500,2500,2500,2,4 i3-5020U,15,500,2200,2200,2,4 i3-5015U,15,500,2100,2100,2,4 i3-5010U,15,500,2100,2100,2,4 i3-5005U,15,500,2000,2000,2,4 which lists CPU model, TDP, LFM, HFM, max Turbo, cores and threads. LFM frequencies of those CPUs fitted to our Latitude E7250/E7450 are therefore set at 800MHz, even though you may not encounter them much due to sustained minimum load under macOS. In the same respect, HD5500 iGPU of those processors typically clocks between 300 and 900/950Mhz. With regards to iGPU throttling, bear in mind that your Hackintoshes are not fitted with the same CPUs and iGPUs as those real Macs we fake them to be. For instance former are fitted with HD5500 GT2 iGPUs when latter are fitted with HD6000/Iris 6100 GT3 iGPUs. Not entirely the same thing...