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Re:Ask HN: Flash Open WRT to TP-Link WR703n v1.7 by noonespecial on Sunday May 31, 2015 @10:06PM (#9636448)
Unfortunately, your best bet is to treat it as a bricked unit and go after it with the tiny little serial pads inside.

I made a little pogo-pin fitting for mine so I can just pop the covers off and stick the rig down into it and send new firmware over serial.

Re:Ask HN: Flash Open WRT to TP-Link WR703n v1.7 by chatmasta on Wednesday June 03, 2015 @12:11AM (#9650535)
The checksum happens when you upload the firmware to flash. OP did not brick router.