The issue of being unable to connect to the TFTP server on a WR30U router after flashing U-Boot provided by OpenWrt

Thank you very much for your patient responses. I'll keep looking to see if there are any other solutions.

Yeah... sorry I can't help any further. Good luck recovering the device.

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I attempted to use a heat gun to heat and remove the flash memory from the WR30U, and then used a CH341A programmer to flash the firmware. As expected, I successfully flashed the firmware (ironically, the CH341A is really slow). However, due to my lack of soldering skills, I ended up damaging the solder points on the motherboard, and now it's just a useless board.