[FS#3724] GL-MT1300 can not use 2.4Ghz wifi

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Anthony (conan92) 

Attached to Project - OpenWrt/LEDE Project
Summary - GL-MT1300 can not use 2.4Ghz wifi
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Device: ramips/mt7621/GL-MT1300
OpenWrt lastest trunk version, with luci installed.

In wireless, when N mode is selected, there is no 2.4G/5G switching option and cannot be set to 2.4G.

After modifying the /etc/config/wireless file, the following errors are reported in the system log.

Sun Apr 4 21:49:15 2021 daemon.notice hostapd: Configuration file: /var/run/hostapd-phy0.conf (phy wlan0) 
Sun Apr 4 21:49:15 2021 daemon.err hostapd: Interface name wlan0 already in use 
Sun Apr 4 21:49:15 2021 daemon.notice netifd: radio0 (10727): Command failed: Invalid argument 
Sun Apr 4 21:49:15 2021 daemon.notice netifd: radio0 (10727): Device setup failed: HOSTAPD_START_FAILED 
Sun Apr 4 21:49:15 2021 daemon.notice netifd: radio0 (10816): WARNING: Variable 'data' does not exist or is not an array/object

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3724

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