friend, the same thing happened to me. my device and Archerc60 v3 (BR)
I tried to install the (EU) version. was in the same boat as you. the solution was to reinstall the version provided by friend @JamesT42 (Archer C60 v3 - is possible to install OpenWrt firmware?), because the version (BR) is not yet available. I followed the steps:
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connect serial and type "tpl" in the putty;
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configure your ip at 192.168.1.100;
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setenv ipaddr 192.168.1.111
setenv serverip 192.168.1.100 -
open tftp, add the downloaded firmware with the name "firm.bin" in the current directory location (default location)
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tftpboot 0x81000000 firm.bin
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erase 0x9f030000 +0x4400b2
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cp.b 0x81000000 0x9f030000 0x4400b2
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reset
ready, the router will restart and then configure your ip in automatic and go to page 192.168.1.1