I just tried with "Retro Text Editor" and was able to reach the bottom of the screen typing via a BT keyboard only.
Here the "Build number" shown on the device is: "2018-01-05_21-38_1.8.3_bc46981" and the "Model number" is "Max 2" -- I found this info in both the "About Device" and "System Update" sections of the bundled Settings app.
FWIW, when I check for an OTA update, a message indicates there isn't a newer update available.
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