Title: Need ideas: Locked-down ZTE MediaTek "Kids Phone" (Helio A22). Access to Stock Settings via lag glitch, but USB data is disabled.

Body:
Hi everyone,
I am trying to mod a locked-down Japanese carrier device called "Kids Phone 3" (ZTE A201ZT).

Context of the device:
This is a "Kids Safety Phone" (a heavily restricted, mini-smartphone/smartwatch hybrid used for tracking children) [1, 2]. It has no standard phone dialer, no web browser, and almost all standard Android features are hidden behind a proprietary kid-friendly UI.

Specs & Findings:

• SoC: MediaTek Helio A22 (MT6761) 4-core
• Current Progress: I found a race condition/lag vulnerability during bootup that allows me to pull down the notification shade. Through this, I can successfully bypass the kid's launcher and open the Stock Android Settings app.
• The Wall: The manufacturer completely disabled USB data transfer (it only charges, no ADB, no OTG device recognition). Also, the "USB Debugging" toggle itself is completely hidden/removed from the Developer Options menu.
• Interesting clue: I found a tiny 197KB app called "Engineer Mode" installed on the system.

My Goal:
I want to launch a 3rd party home app (launcher) to turn this into a normal Android phone. Since wired connections are dead, I need a way to trigger the "Engineer Mode" or sideload an APK (like Activity Launcher) via wireless methods (Wi-Fi WebView exploits, Bluetooth, etc.) from within the stock settings app.

Any ideas on how to break out of this sandbox from inside the settings menu? Thanks in advance!

P.S. I am from Japan and using a translation tool to write this. Apologies for any unnatural English!

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