Gateway Blue Card on Luma3DS A9LH

Have you done any modifications to something called TWL_FIRM? If not, skip part 1 and go to part 2. If you don't know for sure, start at part 1.

Part 1: To use the Gateway Blue card we need an unpatched TWL_FIRM, otherwise it interferes with the patches Luma3DS uses.
As per Luma3DS wiki:

• Download the NAND Firms package from the Luma3DS wiki...

Gateway Blue Card on Luma3DS A9LH