Can I use a pre built uboot.img on emmc for rockpi 4b

maybe a silly question , would it be possible to get a prebuilt uboot image file and burin on emmc to boot rockpi 4b, I hope to get my rockpi working.

Is this the link below to uboot image ?

The link is the pre-built image for the SPI flash.

For eMMC, you can just use the image from with -gpt in name.

Just extract the u-boot image inside with dd.

if=xxx-gpt.img of=u-boot.img count=32768