What is that?
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With this image you can boot to openwrt on TL-WDR7500 without flashing it to spiflash and so loosing original firmware.
Useful for dumping original firmwares without jtag or easy flashing the new one.

How to use?
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0) setup tftp server on ip 192.168.1.100/24
1) for entering u-boot console type "tpl" on message "Autobooting in 1 seconds"
2) type "tftp 0x80060000 image.bin"
3) type "go 0x80060000"
4) ...
5) PROFIT!!!

Warning!
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Especially for the ones that likes to shoot oneself in the foot mtd0(u-boot) and mtd4(art) are unlocked for write access!!!