how to flash recovery

[daliang1215]

my rock64 with ayufan's android 7.1.2 atv . 
I can't find any about install zip from sdcard when in recovery mode.

menu image for recovery mode  :
=====
Android Recovery
Android/rock64_atv/rk3328_box
7.1.2/NHG47K/86
userdebug/test-keys
Use volume up/down and power.
-----------------------------------------
Reboot system now 
reboot to bootloader 
apply update from adb
apply update from SD card
wipe data/factory reset 
wipe cache partition
mount /system
view recovery logs
run graphics test
power off
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is there  no "install zip from sdcard" option? who can help me ?