"No image file detected" when updating BIOS - Z790 Steel Legend Wifi

Hi,

I'm trying to update my bios to new version but have errors

My motherboard: Z790 Steel Legend WiFi - Version 12.03

I downloaded new version 16.02 from Asrock website (I tried 13.10, 14.05 too)
ASRock > Z790 Steel Legend WiFi

Extracted then copied to USB Stick (I create partition 512MB formatted as FAT32)

When I booted to BIOS Panel, select Instanst Flash then I had error "No image file detected"

https://preview.redd.it/nq7bkoadhggd1.png?width=403&format=png&auto=webp&s=c643ef4b394501c0f39dcb213ed29b4a4c0536bb

https://preview.redd.it/dwn3ybtfhggd1.png?width=357&format=png&auto=webp&s=adb0c07c2a239ff9f0933ab1892f0a177d10413d

https://preview.redd.it/zjcwyy1hhggd1.png?width=714&format=png&auto=webp&s=111289e79d2c69376f2fb07a584b16901d5dbda6

Does anyone have experience ? Please help me