TrendNet TEW840-APBO

This is my first post on the forums, so bear with me please and thank you.

I am wanting to upgrade/replace the OpenWRT fw on this device (currently running Attitude Adjustment) wirh the current version.

This device has a QCA9886 + QCA9653 + QCA8334. It is a 5Ghz 802.11ac 2x2 MIMO PtP Bridge.

I have collected some information from ssh on this device and will add links below for the output from commands from the documentation as well as some pictures showing the device.

If anyone is able to give me some guidance or is willing to lend a hand, I am looking forward to adding these devices to the ToH.

TrendNet TEW840-APBO Images @ imgur

TrendNet TEW840-APBO - Output from SSH

https://openwrt.org/docs/guide-developer/add.new.device
https://openwrt.org/docs/guide-developer/adding_new_device

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As per your dmesg this board seems based on the AP152 reference platform. I think, there are already other supported-by-OpenWrt devices based on that, so I'd try to RAM-boot a recent initramfs-snapshot from git master from a similar AP152-device via Serial+Uboot.

Did you already discover the serial-port/uart and connect to it?

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Upper left side, in the 1st photo, by the "nut" ?
One square, three round holes.

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I had not looked at the photos prior to writing my first post in this thread, only the text outputs.
But yes, I agree, those 4 holes look like a UART.

@kg5iru , try connecting there, and check, if you can get Bootloader output, and attempt to interact with the bootloader.

Remember not to connect the (probably) 3.3v pin.