@Joanxie
i am trying to flash uboot on iMX mini using uuu,
it is stuck here:
C:\Users\NXF94256\Desktop>uuu -b sd_all u-boot.bin
uuu (Universal Update Utility) for nxp imx chips -- libuuu_1.5.21-0-g1f42172
Wait for Known USB Device Appear...
1) pls check if your boot mode set is correct or not
2) pls check your device manager, when you connect the board with PC, should pop up the device there