My Archer C20 v1 (22.03.2) has slow wifi.
2.4GHz (40Mhz) is 14 MBit/s, while 5.8GHz (by another router chip) ok.
Old TL-WR740N is ok too (~90 MBit/s 2.4 GHz).
Original firmware, as i remember, was ok too.
The only significant 2.4 wifi errors in log:
Sat Dec 17 10:41:13 2022 kern.err kernel: [ 48.998741] rt2880-pinmux pinctrl: pa is already enabled
Sat Dec 17 10:56:45 2022 kern.err kernel: [ 51.495537] ieee80211 phy1: rt2800_wait_bbp_rf_ready: Error - BBP/RF register access failed, aborting
Sat Dec 17 10:56:45 2022 kern.warn kernel: [ 51.504984] ieee80211 phy1: rt2800_loft_iq_calibration: Warning - RF RX busy in LOFT IQ calibration
Sat Dec 17 10:56:45 2022 kern.err kernel: [ 51.687605] ieee80211 phy1: rt2800_wait_bbp_rf_ready: Error - BBP/RF register access failed, aborting
Sat Dec 17 10:56:45 2022 kern.warn kernel: [ 51.697054] ieee80211 phy1: rt2800_loft_iq_calibration: Warning - RF RX busy in LOFT IQ calibration
Sat Dec 17 10:56:45 2022 kern.err kernel: [ 51.825633] ieee80211 phy1: rt2800_wait_bbp_rf_ready: Error - BBP/RF register access failed, aborting
Sat Dec 17 10:56:45 2022 kern.warn kernel: [ 51.835081] ieee80211 phy1: rt2800_rxiq_calibration: Warning - Timeout waiting for MAC status in RXIQ calibration
Sat Dec 17 10:56:45 2022 kern.warn kernel: [ 51.896097] ieee80211 phy1: rt2800_rxiq_calibration: Warning - RXIQ calibration FAIL
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I'm in a big apartment building in the city. There are a lot of neighbors APs here, but almost all of them are 40 MHz, and they don't interfere with my old router, if that's what you're talking about. I can send a screenshot of LinSSID if you are interested. If i changes the channel width to 20 MHz, the speed does not change at all.(PS: but i could see that my laptop was connected by 40MHz channel when AP was 40 MHz) I didn't have any problems with interfere at all with the old router.
No, but Archer C20v 1 has an unusual procedure for flashing the OpenWRT firmware. However, I think that the errors in the log mention special-purpose registers of some router chip that's do not relate to Flash.