Asrock X370 Killer Sli

I'm doing a computer build for the first time (specs below). Boots up fine, FPS were lacking so I decided to upgrade the BIOS to version 3.50. Followed the manufacturers instructions and upgraded with Instant Flash using the BIOS tool. The upgrade finished and prompted me to reboot.
Asrock X370 Killer Sli/ac Ryzen 2600
After reboot, computer wouldn't POST.Tried a number of things I read here (clearing CMOS, replacing battery, etc) and nothing. The fans would spin up and run for 31.5 seconds, then stop briefly and cycle.Figured I'd bricked the mobo so RMA'd it. Exact same thing happened on the new one - worked fine until I tried to upgrade the BIOS.
I'm following the ASRock instructions for BIOS upgrade exactly, which says to upgrade to 3.50 (bridge BIOS) before going to newest release. The out-of-the-box BIOS is quite out of date so don't want to leave that in place.New mobo on the way but not sure what to try next! Any recommendations?Specs:ASRock X370 Killer SLI/ac MotherboardRyzen 5 2400G CPUWD Blue 500GB SSDEVGA 80+ White 500W PSU8GB Kingston HyperX Fury DDR4 RAM. What are my options if I did this? I assumed I was updating my bios because each time I tried to update, it told me to first use an earlier version and work my way up. I flashed bios 3.0, and now nothing happens when I power on my computer.The fans spin, but no display ever comes on, no beep, no nothing.
I've tried resetting cmos, removing the battery, using onboard video. Nothing works. I'm pretty sure my mobile is bricked now.Is there any way to get back to the default bios that was loaded out of the box?

Hi,Thanks you for this tweaks, but infotunately i already know them alli dont use XMP profile cause not working at all ^^I move the timing manually to get 2400Mhz already, and even when upgrading them by 10, i never get 2666 Mhz.My memory are in A2 and B2 slots.I try to move the memory some times, and I was always jumping the clrCmos jumper.however, by searching in this forum i found somes links giving me sure ram compatibility:do you think about this website? It is sure or maybe some bullsh.t inthere?Edited by Heuvanek - 10 Apr 2017 at 1:28amGenesisDoes. GenesisDoes wrote:I have the same issue with G.SKILL TridentZ Series 32GB (2 x 16GB) F4-3200C16D-32GTZKW.

Both sticks are in A2 and B2, I manually set timings to slower than the rated times (18-18-18-38 to 20-20-20-40). I change voltage from 1.35v to 1.40v and no matter what, it won't POST past 2400. I am using Bios 2.0.Your memory is not in G.SKILL's QVL list for any Ryzen chipset boards:Believe it or not, the Ryzen memory controller seems to prefer tighter memory timings.My G.SKILL FlareX 16GB at 2933 is at 14 14 14 34, 1.35V, and did not work at that speed until I manually set those timings. Do not bother using the XMP profile, it is designed for Intel processor memory controllers.I cannot guarantee your memory will work at lower timing settings, but it is free to try. Be sure the AM4 Advance Boot Training option is set to Auto.