and also holding the boot button is disabling mmc totally making it inaccessible when booted from sdcard

as i already said i don't want to erase emmc. is there a uboot config to do this?

I've clicked the same erase button that is pointed in your screenshot.

I was able to update image from linux machine using `sudo ./upgrade_tool uf ../update.img`. May be its a bug in Windows tool.

I got Core3566 mounted on CM4-IO-BASE-B. I've installed Linero on emmc but I want to boot from Linero installed on SD card. when I insert SD card and boot the Core3566, most of the times it boots from eMMC and occasionally it boots from SD card. how to force to boot from SD card always without remov...

I've pressed erase in RKDevTool connecting my Core3566 in MASKROM mode. Since then it says Download Boot Fail whenever i try to upgrade with 2023-09-13-debian-arm64-HDMI-lite.img or Download MiniLoaderAll.bin. and also reset device fails. I'm able to boot sd card though.

I want to enable few modules or update kernel to new version. How to update just the kernel or uboot on my Core3566 CM4 emmc without reformating. I was able to build the image according to https://wiki.luckfox.com/Core3566/Core3566-SDK/