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 ?
https://dl.radxa.com/rockpi/images/loader/spi/rockpi4b-uboot-trust-spi_2017.09-2692-gdf20631bd8_20200824.img

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

For eMMC, you can just use the image from https://dl.radxa.com/rockpi4/images/ with -gpt in name.

https://wiki.radxa.com/Rockpi4/partitions

Just extract the u-boot image inside with dd.

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