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Hi, yesterday I upgraded the firmware of my router TL-WR940N and now I realize that wifi has less power than before, the router has three antennas but when I'm about 5 meters the wifi power is medium, when before I was at 10 meters and the wifi was full. There is any way to downgrade to the original firmware or downgrade to another firmware of the tp-link's web? I tried going to upgrade firmware in the panel y choose another version but appears an error and I can't.

Firmware Version:	3.18.1 Build 180514 Rel.65124n
Hardware Version:	WR940N v4/v5 00000000