Generally speaking, you can't also update differnet firmware successfully. Which model's firmware did you update? It may damage the device..

don't think they will release portuguese since it's sold many years of this model but only have English version.

try to switch the location of RE units..

Do you mean you set Gaming as high Qos and others normal? However, other activities, such as gaming can't work properly when you start to download? it's not very clear to figure out your settings...

it means Tl-WN722N V1 does NOT support MAC OS.

How about the pc's negotiation speed when you connect to C5400? Even with wired connection, the maxium speed is still 90Mbit/s? Make sure the firmware is the latest one and reset & reconfigure the...