TP-Link AC750 Wireless Wi-Fi Travel Router (TL-WR902AC) v3

Is there a guide on how to flash the TP-Link AC750 Wireless Wi-Fi Travel Router (TL-WR902AC) v3?

Here it is:;a=commit;h=d13b05741a4d05a271d26fc3be61e76530025098

Recently converted a TL-WR90AC v3 to OpenWrt 18.06

Here is what the AP looks like under the plastics.

J1 is the UART Header. TX, RX , GND, +3V3

SW1 Seems to Perform (random number?) initialization which was required to flash OpenWrt 18.06 in the first instance, at least on our device.

When pressed see the following in the UART trace

Uart Trace Reports: "random: crng init done" on Next Boot.

Prior to pressing SW1 we observed some generic lzma decompression error on the Uart.

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