Why my lakka don't update autolly?

Libretro Lakka
#1

hi,erveryone ,merry Christmas. I copy Lakka-RPi2.arm-devel-20161221184608-r21729-g274b40f.img.gz to update folder and reboot lakka,but nothing happen ,update not working.What should I to do to update lakka?

#2

the update file is .tar see http://sources.lakka.tv/nightly/RPi2.arm/Lakka-RPi2.arm-devel-20161221184608-r21729-g274b40f.tar

#3

update successed,thank you.

#4

update successed,thank you.