Chinese tablet only connects to 2G. 3G bands in MtK BandMode greyed out. How to fix? - Android Q&A, Help & Troubleshooting

Hi, I’ve gotten one of these cheap tablets from wish to make a video review about what you get.
Of course, a lot is faked and less than advertised. But that a new device in 2020 only connects to 2G, that is a new low to me. And even worse: it only accept standard SIMS. No nano sim, no micro sim!
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However I saw you can change some internal settings in EngineeringMode and BandMode. Can anyone help me enable at least 3G for sim 1? Cuz it seems like it supports it but is somehow disabled.
See the picture attached.

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MTK Engeneering Tool -> MTK settings > BandMode > Select SIM lists the bands your phone supports: By default, you’d see some ticked bands outlined in White color while others are in Grey. Now, those White colored are the bands your phone supports. Of course the SIM-card must support these. Using a SIM-card that doesn’t support any of those white outlined bands, it won’t work
How did you verify that the SIM-card supports the desired bandmode?

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jwoegerbauer said:
MTK Engeneering Tool -> MTK settings > BandMode > Select SIM lists the bands your phone supports: By default, you’d see some ticked bands outlined in White color while others are in Grey. Now, those White colored are the bands your phone supports. Of course the SIM-card must support these. Using a SIM-card that doesn’t support any of those white outlined bands, it won’t work
How did you verify that the SIM-card supports the desired bandmode?
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Hi, thanks for replying to me!
I'm pretty sure the SIM-card supports the desired bandmode. I've also had this very same SIM-card in my OnePlus One phone and it could connect to 2G, 3G and even LTE fine on there. So both the Carrier and the SIMCard support all networks. Also we still have 3G service using this Carrier in my country until 2022.
As for white and greyed-out bands: I know that the white bands work. The issue is that ALL 3G bands are greyed-out, making the device only connect to 2G (GPRS and EDGE) networks, which are completely unusable in 2020.
I know it is a cheap device and it isn't worth it to spend a lot of time on it, but is there any way to force one or more 3G bands to become white / active?

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Never mind, I have gotten proof that this is in fact only a 2G device by running the “adb getprop” command. It showed the following radio version:
TOPWISE82_TB_2_KK_GPRS_HW(DEFAULT)
Since it contains GPRS I think that’s a 2G only radio...
Why they bother to release this in 2019/2020 is still boggling my mind.