Hi all!
I want to flash my AP55c from Sophos, but i don'T know the right order from the serial cable (UART) and i found nowhere any information about.
I tried changing cable in different postions, no success.
Can anybody help me?
Connecting 4 wires is the 1st mistake, connect
Tx
Rx
Gnd
Have you read https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=6f1efb28983758116a8ecaf9c93e1d875bb70af7 ?
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No, never saw this article
Pin 1 is marked on the silkscreen. Pins from 1-4 are 3.3V, GND, TX, RX
Whats mean that? I don't see pin 1?
Which order i must connect?
After connect i should get DHCP and can flash? Or must i first reset? (How?)
1st pin is usually marked in some way, tricky to tell in your photo.
Once you've flash there will be a DHCP running, yes.
I'd skip the pin to the left.
The text "J2" is next to pin 1. This is because the box around the four pins has a thicker line next to that pin.
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But which order must i do the pins? (color not important?)
Trial and error, but since you know which one is Vcc, you can find the GND and Tx using a volt meter.
GND-Vcc will show a stable (probably) 3.3v.
GND-Tx will fluctuate during boot.
a little bit stupid to get by Sophos no description of the pins...
So i must try and error.
I need GND, TX, RX, right?
Okay, than i must try...
You got three pins to choose from, it ain't rocket science, won't take days to figure out, probably less than a minute.
Correct.
yeah i will try, but with the TFTP i don'T know if its working right. Everytime i got "no gateway, DHCP list empty" -> Anywhere to see if the service are running?
And now after reboot the AP i got no Ethernet Uplink, i must do reboot more times.. Don't know why...
How i see if i have the right pins? In device of my laptop i got everytime "COM3" showed... With different configurations 
You'll get output.
It'll be COM3 until you decide to connect it to a different USB port.