How to unbrick unifi6 plus AP through USB to Serial TTL part deux

[lleachii]

@bishoptf

There is an older thread where it was talking about unbricking a u6+ unit and I had posted there but thought that a dedicated post would be better.

For others to reference:

How to unbrick unifi6 plus AP through USB to Serial TTL?

Bumping this older thread, I have a U6+ and trying to get it hooked up to a usb ttl to see if I can un-brick it. I saw your original threads where you were getting it working on OpenWrt but just trying to make sure I know the UART pinout. I know I will have to solder pins and that is no big deal just trying to make sure I do not do any additional damage. I have attached a pick of the uart section and using a meter where I see voltage and what I think rx and tx are located just would like to get …

(Especially since you similarly named your thread, and the other is still open.)

@bishoptf

Opened a ticket with Ubiquiti and they had me run a rescue command that essentially made the semi working unit turn into a brick. TFTP recovery does not work and since it was purchased from an unauthorized retailer they are not going to replace the unit.

Are you saying that the bootloader is damaged?

@bishoptf

My goal is to try to recover a factory image and see if I can get the unit to boot again.

If anyone can provide some clarity in the mtk_uartboot step as to what additional firmware to use I would be grateful.

Are you referring to the OpenWrt file listed in the Wiki, or are you looking for OEM Ubiquiti firmware?