I used to dream about designing a PCB for the BlackBerry Playbook to run Sailfish OS on that.
To keep the costs low I would go with a SOM having castellated holes on the sides and mount it on a carrier PCB which would interface with the existing connectors. Unfortunately there is not any leaked schematic for the device and reverse engineering the connector pinouts would be cumbersome.
There are some neat RK3399 SOMs in the wild, however I do not know how power efficiently could they work. Furthermore I lack the knowledge of properly designing the power management subsystem for such a battery operated device.
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