IIRC, the PW4 is a dual core device.
If you don't have 4G, then you do have a spare USB port on-board. You should be able to find those threads (on earlier models). At least one of them had added a hub using the 3G port.
The PW4 already supports OTG with both hardware and firmware.
geekmaster has posted threads and details of experimenting with the various remote file systems and remote file system hardwares. Again, older models, but Linux is still Linux.
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