Modified BIOS can be flashed using the SPI flash programmer (in the latest BIOS from Asrock the BIOS digital signature verification is strengthened)
let's try (personally, I prefer to use DOS to update the BIOS OEM:SLP keys https://forums.mydigitallife.net/threads/windows-7-oem-slp-key-collection.10370/ Cert. https://forums.mydigitallife.net/threads/oa-2-x-slic-oemcert-collection.5952/
Thanks. What XRM-MS file should I use. Should it be Dell specified? Last time I did it for Asus 2 years ago and forgot near everything. Is "step-by-step" instruction available here? Can it be used on Win10 cloned from similar PC?