I would add two things. One, for the Mango and the Beryl, I think the GL firmware is compiled with proprietary MTK drivers.
Second, I think you are more likely to find support here specific to the models and be of aid in improving the firmware for other users. Not trying to ignite anything here, just my 2 cents.
Mango 3.212 snapshot; Beryl 3.212 snapshot; Not affiliated with GL-iNet–just a user
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