Did you do the following?
1) Remove all of your hard drives including NVMe drives and USB drives, 2) make sure you set in BIOS to boot into UEFI mode, 3) disable Secure boot in BIOS, 4) disable Fast Boot, 5) Enable Launch CSM, Change BOOT DEVICE to UEFI Only. 6) under key management save the secure boot keys, 7) under PK Management delete key (delete only PK Management Key), 😎
prepare a flash drive for SSD7103 UEFI ROM package, 9) connect your SSD7103 with 2 to 4 NVMe drives to a PCIe x16 slot (it needs to be in a x16 slot if using 4 NVMe drives, 10) boot to the flash drive you created and flash the SSD7103 BIOS (FS0:\> SSD7103.nsh) if successful you will have a message "Passed".
NOTE: BIOS Needs to be in UEFI mode. Secure Boot must be disabled or SSD7103 will not show up. You must ENABLE Launch CSM, save keys and delete only PK Management Key. For flash drive file go to https://highpoint-tech.com/USA_new/series-ssd7103-download.htm
and download UEFI BIOS "SSD7103_UEFI_v1.1.9_2020_09_25.ZIP" extract to root of flash drive. It should have the following files 7103uefi.rom, ArrayCreate.efi, load.efi, README, SSD7103.nsh, startup.nsh and wfi folder.
After steps 1 to 9 from above, insert flash drive you created.
1) With SSD7103 installed in X16 PCIe slot, power on system, boot to flash drive you created, you will see: (see attached)
2 Reboot once you see Passed!
Above is the first steps to see the SSD7103.