I just bought a Hi12, and the latest version arrived this week: the Z8350 processor version.
This has Micro USB, not USB-C so while it’s possible to change it, that isn’t a standard feature, and you’d need to find a USB-C fast charging cable as well as change the connector inside the tablet. (The difference is that USB-C doesn’t have a “right way up” so it’s easier to insert, not that it’s any more child proof than Micro USB.) And … a quick scan of the internet shows that teh connections are different: MicroUSB has 5 PCB connectors
http://uk.rs-online.com/web/p/micro-usb-connectors/7142344/
while USB-c has what looks like 11
http://www.digikey.com/product-detail/en/mill-max-manufacturing-corp/898-43-024-90-310000/ED1391CT-ND/5213140
I’m not opening mine up to find out (that would invalidate my warranty) but almost certainly the connector is a surface mount component, so you will need a pretty good rework station to avoid damaging the tablet any further, but the component itself should be an “off-the-shelf” part you can buy from your local RS, Farnell, or other electronic component supplier. You’ll need good eyes and fingers to change it though! :laugh:
I’d suggest that you find the tablet mender first, and ask him / her – Micro USB is a well established standard and they get broken at a good rate so he probably is used to changing them in phones and suchlike already.