[FS#3969] Low RSSI on MikroTik RouterBOARD hAP ac² with OpenWRT 21.02 (RBD52G-5HacD2HnD-TC) - ipq40xx (Attachment added)

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FS#3969 - Low RSSI on MikroTik RouterBOARD hAP ac² with OpenWRT 21.02 (RBD52G-5HacD2HnD-TC) - ipq40xx
User who did this - Richard Stanway (notr1ch)

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I am also having this issue with a fresh 21.02 booted from initramfs. Looks like an issue with the calibration data? Scanning for my home network, I can't even pick up the 2.4 GHz from 5 meters away and the 5 GHz shows at -105dBm (usually -45dBm at this location on a cellphone). Wireless on both frequencies works fine when booted back to RouterOS.

root at OpenWrt:/sys/firmware/mikrotik/hard_config/wlan_data# ls -al
drwxr-xr-x    2 root     root             0 Aug 31 22:20 .
drwxr-xr-x    3 root     root             0 Jan  1  1970 ..
-r--------    1 root     root             0 Aug 31 22:20 data_0
-r--------    1 root     root             0 Aug 31 22:20 data_2

I have dumped a few hopefully useful files.
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One or more files have been attached.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3969#comment10131

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