The app that asks for the pin hides the keyboard?
I don't care if it was Hauwei or Ford that wrote the app, I'd send a very polite letter (paper, not email) to the CEO (I'm not being facetious here - be VERY polite) expressing both my amazement and my extreme displeasure. You might be surprised at the results a little "pardon, your slip is showing" can bring.
Until then, if you can get the use of a Bluetooth keyboard, try that. Or MyPhoneExplorer, setting its keyboard (which will run on your laptop, desktop, whatever) as the default, at least until you get this job done.
