Hello, I have the same tv box. i failed to boot from sd card. will you give a full process detail (This is the only method that worked for me: I re-recorded the U-boot using Windows 10 and RKDevTool GUI.
I download U-boot from here:
https://github.com/hexdump0815/u-boot-misc/blob/master/misc.rk3328-no-sd-boot/rockchip-u-boot/u-boot-image-for-emmc-h96max-rk3328.img.gz
Then I recorded to the SD card using the Multitool from straight from this thread. (u-boot-image-for-emmc-h96max-rk3328.img.gz) I download this file and failed to rerecord with RKDeveTool. Also, any expert can be help. Thx.
Special request to JOCK.
u-boot-image-for-emmc-h96max-rk3328.img.gz