https://handhelds.wiki/index.php?title=R36S_Hardware_Modifications&action=edit§ion=1
Editing R36S Hardware Modifications (section) - Handhelds Wiki
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https://onlinedocs.microchip.com/oxy/GUID-3F92BDF1-2107-414B-97E6-A893094DDC32-en-US-1/GUID-EAF3E464-2E2F-472D-BCB1-E580BA697DD4.html
3.5.3 Hardware Modifications
The on-board debugger is connected to the PIC16F15244 by default. These connections must be removed before any external microcontroller can be programmed or...
hardware modifications
https://www.verizon.com/support/knowledge-base-141967/
Check for Physical Damage - Hardware Modifications | Verizon
Here's how to determine your device has hardware modifications.
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