Boot from SD/USB flash media is not supported.
ESXi 7.0u3 support starts at ESXi 7.0 Update 3i. For build information see https://kb.vmware.com/s/article/2143832
For support of "Zen 4c" or AMD 3D V-Cache™ technology, contact your hardware vendor for the minimum BIOS/UEFI firmware version required.