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(A7) Me FW Downgrade - Request MeSpiLock Failed

I have an Inspiron 7559 that is failing to boot. It displays "(A7) Me FW Downgrade - Request MeSpiLock Failed" just after showing the white Dell logo.

I think my daughter turned it off when an automatic BIOS upgrade was started. The system was reporting the BIOS was at 1.2.0 but it couldn't see any USB drives. I ran BIOS recovery which left me with version 1.1.3 and the ability to see USB drives - still not able to boot into Windows 10.

I downloaded the latest firmware (1.2.1) and created a new bootable USB drive to update my firmware. If I run the Inspiron_7559_1.2.1.EXE from a DOS prompt or from the BIOS Flash Update option after hitting F12 it fails with "Unable to start a Secure Flash session".

Running from DOS:

I get promoted to Start to Flash: Y

Decompress ROM completes.

Get related info.

Uploading the ROM into the BIOS completes.

Uploading the ME Capsule data into the BIOS completes.

Begin to update BIOS from version 1.1.3 to 1.2.1 fails with "Error: Unable to start a Secure Flash session."

I've tried various boot settings of UEFI/Secure, UEFI/NotSecure and Legacy. Also Dell DDDP and Rufus to make bootable DOS USB drives.

I've also tried using the recovery utility (hold esc + control when connecting in the AC power) with a USB and a BIOS_IMG.rcv - I get a black screen and 3 amber flashes followed by 4 while flashes on the LED. Without a USB I will get the recovery screen.

Diagnostics did not report any issues.

Would love to know what I need to do flash this laptop. This security stuff is really annoying.

Thanks!