Windows 10: ei.cfg doesn't work for upgrade in place from Windows 7

Hi all, been beating my head against the wall for 3 days on this. This is one of two Windows 10 upgrade problems that I have.

I have a Dell Inspiron 15 7559 that came pre-installed with Windows 10 and the key embedded in the Bios. Specifically, ShowKey Plus Releases . Superfly-Inc/ShowKeyPlus . GitHub shows the OEM key and edition as:
Original Key: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
Original Edition: Win 10 RTM Core OEM : DM
EULA Type: OEM

I wiped the machine and installed Windows 7 Professional instead, which is fully activated and fully updated as of yesterday with a legal, paid-for OEM key, but now I want to upgrade to Windows 10 Professional.

I downloaded MediaCreationTool1909.exe from Microsoft, created the ISO, burned it to a 16GB usb key using Rufus and tried to upgrade by executing setup while logged on as Administrator in the Windows 7 installation. I am getting the dreaded "You can't keep Windows settings, personal files, and apps because you're installing an edition of Windows that's different than the one you're currently using".

Once I figured out that the key embedded in the BIOS was causing this, I created and stored in the <USB key drive>\sources directory a ei.cfg file which looks like this:
[EditionID]
Professional
[Channel]
Retail

I also tried any number of other combinations based on various forum posts, such as
[EditionID]
[Channel]
_Default

In all cases, the setup ignores the ei.cfg, does not give me a menu to choose, goes right to the "Choose what to keep" with the "apps, files and settings" greyed out and the "can't keep" message.

SetupDiag says:
SetupDiag: processing rule: FindAbruptDownlevelFailure.
.....
Error: SetupDiag reports abrupt down-level failure.
Last Operation: Finalize
Error: 0xC1900205 - 0x4000B
LogEntry: 2019-12-24 11:05:24, Error MOUPG CDlpActionCompat::ExecuteMigChoiceScan(1658): Result = 0xC1900205

Refer to "https://docs.microsoft.com/en-us/windows/desktop/Debug/system-error-codes" for error information.

SetupDiag found 1 matching issue.
---------------------------------

What is errorcode 0xC1900205? I can't find documentation for this anywhere. I could, I guess, let it install the OEM version since I don't much care about whether I need to re-install or not, but I want Windows 10 Professional as I should be able to get.

Why doesn't this work? Any help at all would be most appreciated as I am dead in the water here.

Thanks in advance

:)

 

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I`ll do it and I`ll be updating this thread when I have the report.

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Info: 0xC0EA000A

Manual activation doesn´t work either.

Important (i think): I had to re-install windows 10 (3 or even 4 times). because I had massive problems with "Start and Cortana Issues".

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PS. Yes, Windows 7 was genuine.