I was trying to update my tp-link wr840n(EU) v4 router to use the lede firmware and used the snapshot openwrt-ramips-mt76x8-tl-wr840n-v4-squashfs-sysupgrade.bin which I downloaded from the site. My router couldn't properly restart as all the led lights were blinking. I used the openwrt-ramips-mt76x8-tl-wr840n-v4-squashfs-tftp-recovery.bin to try and recover but the wi-fi function is no longer enabled. I have tried to restore with several firmwares but all have failed(they make the led lights blink again). If anyone has a solution they could suggest I would be very grateful. Many thanks in advance.