I got and old kindle 8th gen (SY69JL) for free, 'cause it couldn’t connect with any wireless network. I tried to do the bridge for popcorn hack as seen here (https://kindlemodding.org/jailbreaking/Legacy/Popcorn/KT3.html). Stupid as I’m, I used the 60w solder and I thing I ripped one of the pads. The damn thing doesn’t turn up (not even the led) or shows at lsusb. Is this now just an e-waste? It gets a little warm when puggled on the usb.
I can highly recommend surgical scalpels to work on PCBs. It also sounds like the shorting of the two pads only has to happen once to flash the firmware, so maybe you could use one of those cheap needle probes to temporarily get contact with the via under the ripped off pad.
Neat!