If the phone is still functional and you just need to perform internal diagnostics, use the built-in software testing mode instead of hardware pins: Open the Phone dialer.
Using or LG UP :
To access the test point on your LG K52, follow these steps: lg k52 test point
Before opening your phone, ensure you have the following ready: If the phone is still functional and you
This is where the (often called EDL or Emergency Download Mode) comes in. This hardware solution forces the device into a deep-low level state, allowing you to flash firmware or unbrick the phone even when the software is corrupted. lg k52 test point
: Always disconnect the battery before attempting to short any points to prevent electrical damage.