Problem reverting 840n

Hello everyone. I need to revert back my 840N v4 to original TP-LINK firmware. So I downloaded the original firmware from TP-Link site, rename as tp_recovery.bin and did the upload it using tftp. After this my router is rebooting. I tried to put back the OpenWrt and the problem is the same. What I need to do to have my router back? :slight_smile: