Orange Pi Zero Plus H5 UART pins don't work

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Hi, I've got an Orange Pi Zero Plus H5 running "Armbian_5.91_Orangepizeroplus_Debian_buster_next_4.19.59.img" but I can't seem to connect to it via the three UART pins next to the Ethernet port. I'm using this adapter using both the Windows supplied and the manifacturer's drivers. I've also tried adding "uart1 uart2 uart3" to the overlays line in /boot/armbianEnv.txt and rebooting but with no luck. I'm using PuTTY on my laptop connecting via COM7 serial port (as shown in Device Manager) with baud rate 115200, but the PuTTY screen stays black with nothing coming in. Is there something that I'm missing?

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