arduino yun image updation problem

thanks in advance

i have faced problem while using"opkg update" and "check signature error" :frowning:

so i updated image file "openwrt-ar71xx-generic-yun-16M-squashfs-sysupgrade"

problem continued

so i try this method

i have updated a wrong image to arduino yun
i using "openwrt-ar71xx-generic-linino-yun-16M-squashfs-sysupgrade"
i have downloaded from ""

after updating NOTHING will work
only some basic option only working

Now WiFi, Ethernet and Bridge can't working. :confused:
if there anything possible to HARD RESET or Re-Flash yun image? :disappointed_relieved:

i have tried reset linio processor by pressing "wifi reset" button on 30seconds

please help me guys.