[FS#1245] [Netgear R7800] 2.4GHz wifi stuck at 20MHz (40 MHz channel width doesn't work)

[LEDE Bugs]

The following task has a new comment added:

FS#1245 - [Netgear R7800] 2.4GHz wifi stuck at 20MHz (40 MHz channel width doesn't work)
User who did this - Mirco Ebasta (Aye24)

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With the stock netgear firmware it's always at 40MHz, and I don't have other wifi near my house.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1245#comment4034