Hi
First of all you wanted to install openwrt or just wanted to revert to tp stock firmware!?
Connect your lan cable to port 1 if you want to install openwrt I suggest you to install 18.06.5 stable release
You can find factory image and sysupgrate here
Upload (tp_recovery.bin) via tftp and wait until the router restarts after that update your router with sysupgrade image
I say it again connect your lan cable to port 1 and disable your windows firewall
I don't suggest you to install SNAPSHOT
Let me know
Good luck
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