Need help reflashing OEM to TL-WR841N

Hello, I'm using the latest version of OpenWrt on a potato router and I want to reflash the OEM firmware to my TL-WR841N V8.4.

I'm a complete noob at flashing with serial and other things and LUCI doesn't have sysupgrade support.
I have a copy of the TL-WR841N_V8_140724 firmware, which have this bin file: wr841nv8_en_3_15_9_up_boot(140724).bin

Please help me.

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