https://www.overclock.net/forum/11-amd-motherboards/1733304-agesa-fw-stack-patched-bioses-3rd-gen.htmlThat appears to be the thread with all the bios's.There anything for the C6H added on the 7403 that was the latest public one and I think newer than...
Make sure you pull the CMOS battery completely out for a few minutes. I hit the "RESET CMOS" button dozens of times when trying to get my 3900x to boot, but finally pulling out the battery (its located under the GPU :() fixed it for me.Also set the V...