Cant get new RYZEN CPU to run with AB350 gaming K4

I checked the cPU compatibility list for the Motherboard and up dated the BIOS to 5.80 which is the highest i can go as my current CPU is a summit ridge RYZEN 5 1600, i checked the serial number of the new CPU and it matched exactly the number of the 7 3700X (3rd gen ryzen CPU) i want to upgrade to, and it said that the bios version needed to to be 5.80 or higher so i purchased the CPU brand new fitted it into my PC and it wont boot up..the PC stats runs for 10 seconds then as soon as the CPU fan starts the PC reboots itself and does that over and over.

so i double check every thing making sure the CPU/fan are seated properly etc..exactly the same issue..
so in order to get my PC working i reinstalled my old CPU and it booted up straight away.

I have no idea how i am supposed to get my PC to boot up with this CPU
if you check the CPU compatibility list for the Gaming K4 Motherboard you will see this very CPU listed as 100% Compatible
apart from the fact that i have effectively wasted £200 what else can i try to get it running..its really annoying when i was so careful to only get CPU that is on the compatibility list for my motherboard and it wont work

Hi Thanks for your reply...5.40 was on the board before i upgraded to 5.80
i followed the upgrade path for a summit ridge CPU
on the 7 3700x CPU that i have purchased to upgrade to (so i can run Windows 11) the requirement according to the CPU support list for my Motherboard is 5.80 or higher..so there should be no reason at all why it wont boot up perfectly normally
I have emailed AS ROCK System support as well as posting on this forum so hopefully they will also get back to me with a reasonable solution

I bought in brand new in the box the seal was completely intact and i registered it with AMD by scanning the QR code on the label and they confimed it was agenuine AMD product and the hologram was correct for a genuine boxed item..yet i still cant get it to boot it is very strange because it is like it doesn't work
AS ROck system support got back to me and told me to update the BIOS to 6.40 which i did but still no luck

threadzipper1957 wrote: Hello Stu, Which BIOS was on the board, before you flashed the BIOS? Keep in mind you have to have at least Version 3.40, before updating to the latest BIOS, 3.40 is a bridge BIOS, then the next step would be to update to BIOS to 5.40, from there you can update to 5.80 and above http://www.asrock.com/mb/AMD/Fatal1ty%20AB350%20Gaming%20K4/index.asp#BIOS

I'm at 3.00 can I just jump right up to the bridge BIOS or do I have to work my way up to 3.30 to safely install newer BIOS updates?