GL-MT300N-V2 (Mango) very low ethernet speeds (1Mbps and 10x the ping) when used as WiFi bridge

Router
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Hello guys, I purchased a few months ago the Mango to use it as a WiFi bridge for my Philips Hue Hub. It worked, so I didn’t think much about it. Recently tho I tried to connect my Raspberry Pi 4 as well and to my very unpleasant surprise, I realized it would only provide about 1Mbps of internet to the RPi.

Now, the Hue Hub doesn’t need a whole lot of bandwidth, so I’ve never noticed, but I don’t understand why this is happening.

The WiFi signal in the room is very strong (my smartphone, for example, receives about 90% of the total bandwidth compared to Ethernet testing.

I tried both repeater and WDS mode (I have a Flint 2 as a router), but both yielded very poor results.

Tested it on my PC as well. Regular speed test would be 36D/6U Mbps (with SQM), 10 ping and sub 10 download and upload latency.

Why do you think that is?

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One thing I forgot to mention. When setting it up months ago, I was having issues with devices disconnecting when applying the Network mode, making it impossible to actually apply the settings. After doing some research I found that using a 3.x.x firmware fixed the issue, being the 4.x.x too heavy or something like that. I downgraded and it worked. As a result tho, I have a very old firmware version