Dude, thanks so much for your work. As far as I know you are the only person still pushing out roms for the snapdragon phone. I am loving the Pixel experience. With the massive restrictions on this device you have achieved the most customization. I dont know if you still own a G955U but I have two since i bricked one. I have tried everything to fix it and just cant do it. I dont have any money for a medusabox or a soldering iron to make a jig to get it into EDL mode and fix it, but if you want to take a stab at it the phone is all yours. Its got some small cracks on the front (less cracked then the working s8+ im using now). This thread is the exact screen I get with it except it does not show up in device manager as what the op's does mine just says samsung composite device. If you want it I can ship it, if you dont can I pick your brain to see if I can get it working. Its much less cracked than my current phone.
https://xdaforums.com/galaxy-s8+/help/samsung-s8-sm-g955uzkatmb-boot-error-t3726832
You don’t need and soldering or jigs you just simply take phone apart and jump the test points with a wire. It does require removing mother board and a heat shield as points are underneath if I recall but other than the screwdriver too take phone apart and a jumper wire which I just electrical tweezers to do the jumping no special stuff is required. There are schematics on easyfirmware that maybe helpful also some pics floating around that may help. I don’t mess with the phones taking them apart anymore my eye sight just isn’t good enough for me to mess with circuit boards so I pay someone too do them now if I screw them up
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