Can't boot NAND, emmc only boot to uBoot - how do I recover?

Banana Pi Router design BPI-R3/R3 Mini(MT7986)
1

I’m trying to update my banana pi R3 Mini to the latest OpenWRT. I made the mistake of asking chatgpt how to do it, and that has let me to where I’m at. I can’t get anything to show up on the USB UART or a screen connected session when it’s set to NAND. When set to eMMc, I can boot into U-Boot. I can load an on by sending it with sx, but I can’t get anything to work as far as saving a new image to the system to update it to.
I’ve tried a USB drive, rx, cat-ing a file that’s base64 encoded, but there’s not base64 command to decode it, and even putting a file in memory, and trying to retrieve it via /dev/mem. None of these options are working. Can anyone point me in the right direction? Is there a tutorial I should be following? help?

Thanks

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There are several posts about mtk_uartboot here on the forum. It is another way to boot the board into something from where you can recover.

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