G502 lightspeed not working except for battery lights

Good evening.

So I got a cheap used G502 under the pretense that the USB was busted and while it would charge, on wired mode it would not work, windows would not recognize it, or even give the little jingle when plugged in... but it would charge.

So I think "ok challenge accepted, it's probably that the data bus on the usb is busted. I solder in a new one and I get a cheap wireless G502 that I've been wanting for years!"

Nope, wireless doesn't work either, G-hub detects the dongle but that's it, It turns on but it doesn't pair with the dongle, it's like the firmware is stuck in some weird infinite loop. The battery indicators are always on and the Logitech logo light is always off. Switching it on and off does almost nothing as well, all it achieves is flickering off the battery indicators for a split second before they turn right back on. If I do it quick enough then maybe the logitech logo light will flicker on for just a nanosecond.

I opened up the device to see if I could figure out what I'm dealing with, here are pictures:

So yeah, and since it's second hand I doubt Logitech is gonna let me RMA this. Any ideas?

As far as I can tell the button daughterboards seem fine btw.