How To Use Secret Codes On Samsung Galaxy A7 -2... [portable]

Do not change settings in the Service Mode if you aren't sure what they do; it can disable your cellular data.

*#2663# – Firmware Update Menu. Use this to manually refresh the TSP (Touch Screen Panel) firmware or Wi-Fi versions if they become unresponsive. Important Safety Warnings How to Use Secret Codes on SAMSUNG Galaxy A7 -2...

#12580 369# – Complete Software and Hardware info. This includes the RF call date, which tells you exactly when the phone was manufactured. Do not change settings in the Service Mode

*#0228# What it does: Opens the Battery Status menu. Shows voltage, temperature, and battery level in raw ADC values. There’s a “Quick Start” button – do not press it unless you want to recalibrate (which can cause a sudden phone shutdown). Useful for checking a swollen or failing battery. Important Safety Warnings #12580 369# – Complete Software

If your screen is flickering or your vibration motor feels weak, use these codes to run a manual diagnostic check.