Question ASRock A620I Flashback Failure?

[alexazman]

I just recently tried to build an AM5 platform using an ASRock A620I MITX board with an AMD Ryzen 5 9600X. The build refused to boot with the only indication of power being the light connected to the power switch lighting up, and I suspected that the motherboard did not have the right BIOS. I tried to flash it using the flashback feature, and nothing worked. I tried both with and without the CPU, with and without RAM and a combination of both, using creative.rom or PSPBIOS.img combined with BIOSUBU.BIN, formatting my thumb drives, and reseated the cables multiple times. Should I just get the board RMA'd?

 

[helpstar]

usb drives fat32 formatted?
files moved to the root directory? no folders used?
BIOS version 3.20 used?

Did you place the additional file

BIOSUBU​

as well on the stick?
"If you are using the flashback update, please ensure to pack the BIOSUBU file with the BIOS ROM."
https://download.asrock.com/BIOS/AM5/A620I Lightning WiFi(Phoenix)ROM.zip

PSU completely plugged in? 8pin EPS and 24pin ATX main power connector plugged in?
all plugged into the PSU as well?
Which model is it?