Bluetooth on PineTab

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Pinetab is an excellent product.

I'm working on getting the Bluetooth connected. The page Wifi and Bluetooth on PineTab 2 mentions the command

Code:

hciattach -s 1500000 /dev/ttyS1 any 1500000 flow nosleep

but I get the following errors.

Code:

Can't get port settings: Input/output error
Can't initialize device: Input/output error

Any suggestions on how to get the Bluetooth working on Pine Tab?