CPE COMFAST CF-E110N won't work after downgrade

I'am using several ComFast E110N v2 for over a year very successfully with LEDE/OpenWrt software. However they use the E320 v2 version, as this model has the same hardware, except the LEDs.

First of all: the Comfast AP's have the typical Chinese software 'solution' which doesn't work for me. My recently bought E355ac V2 didn't even show the factory GUI at all ;-((

In my factory new E110N-v2's I could successfully flash the OpenWrt firmware via the factory GUI. Because the Comfast factory firmware is already OpenWrt based, an upgrade version will do the job.

Does the factory GUI not show up, or was a previous flash faulty, you can flash firmware (both factory files and OpenWrt) via TFTP.

Rename the firmware in firmware_auto.bin.
Place the firmware on your TFTP-server, address 192.168.1.10
Connect the E110 via his WAN port (as labeled by ComFast) with the TFTP-server.
Power up the E110.
The E110N looks during boot at both ethernetports for firmware on the TFTP server (as do other Comfasts), but by using the WAN port, wich becomes the LAN port after flashing LEDE/OpenWrt, you have access at once to Luci (at 192.168.1.1)
Do not power down/power up the AP before disconnecting the TFTP-server - otherwise the process repeats!

As said, I have flashed several E110N-v2 successfully with the LEDE/OpenWrt firmware originally built for the Comfast E320 V2. LAN and WAN ports are reversed and the LEDs don't work all correctly - but who cares?

The E110N-v2 seems to offer more tx-power than advertised: after choosing 'auto' for tx-power some models read out 25 dBm or even 26 dBm in the GUI - even with the same firmware. Field tests have proven that selecting 25/26 dBm in LEDE/OpenWrt actually gives a higher signal in the receiving smart phones, than when manually selected the factory advertised max of 23 dBm.

Another modification I always do, is placing a little heatsink on the QCA9531 chip inside the accesspoint - as you will find in more expensive AP's. Perhaps not necessary, but it won't do harm anyway.

One not solved 'problem' I have with the E110N-v2 is the noise level LEDE/OpenWrt reads out during WiFi connections. Some units read out the advertised -95 dBm, but most only have -88 or -89 dBm. Field tests prooved a decrease in both upload speed from smart phone to AP (under same conditions) and maximum distance connections can be made.
My E355ac-v1/v2 and WR72 (running E355ac-v2 firmware!) both have their advertised values.

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