I’m on Arch Linux, using KDE. My phone is a Samsung Galaxy J7(J7ltespr). When i’m in downloaded mode and connect the phone to my device, my PC doesn’t recognize the phone. When I do
nothing pops up. I’ve enabled OEM unlock AND USB debugging. I don’t really know what’s the problem, though one thing I’m bit suspicious about is that the USB cable that I’m using isn’t the original one(that one is long gone) but rather a cable I’m using from another(VIVO) phone. But I don’t think that’s the problem as when I connect the USB cable when I’m NOT in downloaded mode, my PC recognizes it just fine.
There is another source for the Samsung model, the regional variants are sometimes very faint indeed on the back of the case. Our supported variants are all SM-J700… as at the foot of Info about Samsung Galaxy J7 (Exynos) - j7elte