Universal image update (20191222) with kernel 5.5.0-rc2   Also added u-boot file for Allwinner H6 (to write to the universal image when running on Allwinner H6). The order of adding u-boot to SD card for universal image is the same as described earlier in this topic (two DD commands are used).      Write u-boot to SD card. U-boot replacement is performed by two commands. dd if=u-boot-<model>.img of=/dev/<SD_card> conv=fsync bs=1 count=442 dd if=u