Khadas VIM2

VIM2 responds to pressing the function button three times, with the blue LED blinking briefly, but after that nothing happens. The only thing that worked was connecting via UART and after resetting I got this (see screenshot). Where, in addition to the lack of loading, this line confuses me DDR3 chl: Rank0+1 @ 912MHz - FAIL Apparently, I have a problem with u-boot, and maybe a hundred more. I would like to get advice on which direction should I move? In advance, thank you very much to everyone who responded!)