BlackBerry/TCL has disabled the described method of gaining access to the advanced features of the Updates app in the firmware versions of October 2017 and later. However, there's a way to still get access using the Janus vulnerability and installing an older or patched version of the updater. But this, too, will be gone after the December 2017 update.
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USE THESE AT YOUR OWN RISK! Especially the Engineering Mode has a few options which can trigger DTEK (showing your OS as compromised) and probably do worse.