RK3399 sd升级固件问题

使用sd升级固件，SD_Firmware_Tool工具打开升级固件失败，请问是什么原因
update.img是这样生成的
root@ubuntu:~/rk3568/tools/linux/Linux_Pack_Firmware/rockdev# ./rk356x-mkupdate.sh
start to make update.img...
Android Firmware Package Tool v1.66
------ PACKAGE ------
Add file: ./package-file
Add file: ./package-file done,offset=0x800,size=0x28e,userspace=0x1
Add file: ./Image/MiniLoaderAll.bin
Add file: ./Image/MiniLoaderAll.bin done,offset=0x1000,size=0x5e1c0,userspace=0xbd
Add file: ./Image/parameter.txt
Add file: ./Image/parameter.txt done,offset=0x5f800,size=0x1f4,userspace=0x1
Add file: ./Image/uboot.img
Add file: ./Image/uboot.img done,offset=0x60000,size=0x400000,userspace=0x800
Add file: ./Image/misc.img
Add file: ./Image/misc.img done,offset=0x460000,size=0xc000,userspace=0x18
Add file: ./Image/boot.img
Add file: ./Image/boot.img done,offset=0x46c000,size=0x141a000,userspace=0x2834
Add file: ./Image/recovery.img
Add file: ./Image/recovery.img done,offset=0x1886000,size=0x1bd4200,userspace=0x37a9
Add file: ./Image/linuxroot.img
Add file: ./Image/linuxroot.img done,offset=0x345a800,size=0x2ec01000,userspace=0x5d802
Add file: ./Image/oem.img
Add file: ./Image/oem.img done,offset=0x3205b800,size=0x1100000,userspace=0x2200
Add file: ./Image/userdata.img
Add file: ./Image/userdata.img done,offset=0x3315b800,size=0x500000,userspace=0xa00
Add CRC...
Make firmware OK!
------ OK ------
********RKImageMaker ver 1.66********
Generating new image, please wait...
Writing head info...
Writing boot file...
Writing firmware...
Generating MD5 data...
MD5 data generated successfully!
New image generated successfully!
Making ./Image/update.img OK.