TP-Link TL-WDR4300 v1 issues with 5GHz in OpenWrt 18.06.2

Installing and Using OpenWrt Network and Wireless Configuration
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I Have TP-Link TL-WDR4300 v1 and it's working flawlessly. Have you tried changing your channel width to 20 MHz? because 5GHz with 40 MHz channel width not working in my selected country (Indonesia)

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