download u-boot from archer c7v2 u-boot archer c7v2 and edit the mac with hex editor with your mac. Mac address start at offset 0x1FC00.
update u-boot via console throught tftp. to stop u-boot from autobooting type "tp" and use following command:
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tftpboot 0x81000000 u-boot-c7v2.bin
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erase 0x9f000000 +20000
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cp.b 0x81000000 0x9f000000 0x20000
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reset
after u-boot was updated, boot with openwrt archer c7v2 image from memory with following command: -
tftpboot 0x81000000 openwrt-19.07.2-ath79-generic-tplink_archer-c7-v2-initramfs-kernel.bin
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bootm 0x81000000
from here, you can flash with sysupgrade image from official openwrt.
to make wan port working, edit file 02_network at /etc/board.d/ and find board archer c7v2 definition and change to with:
ucidef_add_switch "switch0"
"0@eth1" "3:lan" "4:lan" "5:lan" "2:wan" "6@eth0"
and delete file "board.json" at /etc directory and do reboot.
