how to update to catalina from Mojave Dell Latitude 7480

[Nancy10]

I have tried -igfxvesa and -disablegfxfirmware and fakeID/platformId = 0x12345678 all together and still stuck at : could not register with the framebuffer driver

 

[Nancy10]

for a quick update i tried reinstalling macOs from recovery but i kept getting the "could not create preboot for apfs install" error during install

[Nancy10]

I am trying to figure out how to change the Framebuffer Memory in order to try and fix the KP but i ccouldn't find out what values to use, 

I saw this on WEG Github : https://github.com/acidanthera/WhateverGreen/blob/master/Manual/FAQ.IntelHD.en.md 

 

but couldn't find how to reverse, the bits correctly ( no standard reversing onmine could do the trick ), and didn't find how to get the initial values that they are using in the examples.
these are the recommended framebuffers for laptop from the WEG GH :

 

ID: 591B0000, STOLEN: 38 MB, FBMEM: 21 MB, VRAM: 1536 MB, Flags: 0x0000130B
TOTAL STOLEN: 39 MB, TOTAL CURSOR: 1 MB (1572864 bytes), MAX STOLEN: 136 MB, MAX OVERALL: 137 MB (144191488 bytes)
Model name: Intel HD Graphics KBL CRB
Camellia: CamelliaDisabled (0), Freq: 1388 Hz, FreqMax: 1388 Hz
Mobile: 1, PipeCount: 3, PortCount: 3, FBMemoryCount: 3
[0] busId: 0x00, pipe: 8, type: 0x00000002, flags: 0x00000098 - ConnectorLVDS
[2] busId: 0x04, pipe: 10, type: 0x00000800, flags: 0x00000187 - ConnectorHDMI
[3] busId: 0x06, pipe: 10, type: 0x00000400, flags: 0x00000187 - ConnectorDP
00000800 02000000 98000000
02040A00 00080000 87010000
03060A00 00040000 87010000

 

are the initial values one fo the last 3 lines ? 
To be clear i am already using the 32Mb patch (the one set up by default in the rehabman repo of config.plists).
 

I also didn't find how to change the DVMT value in bios and i don't have windows to really try the extraction method from here : 

 

would assuming the DVMT is set by default to 39Mb and changing to that in the clover framebuffer memory, damage my hardware or it would spit out an error ?   

[Nancy10]

I am still going with my fixes and i just backed up my data in case i do a complete reinstall, but when i went into diskUtility i figured that the update process created an additional volume called APFS - Data and it didn't do anything with it afterwards, here is an image from diskUtility : 

 

Does this mean the update didn't finish correctly ? 

 

[Hervé]

No, what you saw is perfectly normal. You've just got some significant catch-up to do re: macOS Catalina.