I recently bought some Unifi hardware from the newer AC range, installing LEDE is becoming more of a mission. We use these a lot for custom hotspot gateways.
These are currently flashed using the mtd command or through uboot and a USB serial cable, however it seems that Ubiquiti have removed mtd from their newer unifi firmware so you need to first downgrade before being able to load LEDE - however its only a matter of time before the older firmware is no longer available and Ubiquiti starts blocking downgrades in newer firmware - so there goes that method of flashing.
Its also widely known TFTP can't be used (holding in reset while powering up to access recovery mode) because firmware images are being signed, anything not ubiquiti is rejected.
Which leaves the uboot and USB serial cable or JTAG as the remaining methods - both of which require opening up the unit which Ubiquiti have also made very difficult on newer designs, you almost need to break the casing to get in.
Does anyone know if there's any other easy method apart from mtd to flash these?