The bootloader does not see the iso image

I uploaded the image on the official website. The built-in bootloader finds the flash drive but does not find the image (it sees other images). I tried to record the image through the terminal, the image was recorded, but when I try to install the OS I get a black screen and the message GRUB. Dear Fomumites, please help. I use one operating system - Ubuntu

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Write the ISO to your USB disk using dd as described in the guide: