Samsung Guru Music Reset Code: How to Hard Reset Samsung Button Phonein 1 Minute

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Irreversible Data Loss Warning

Entering full reset secret codes executes a low-level format of the phone’s non-volatile internal EEPROM/Flash storage. All contacts stored on phone memory, call logs, SMS text messages, customized ringtones, and user files will be permanently deleted without prompting for confirmation.

Comprehensive Guide: Resetting Samsung Feature Phones Using Master Codes

Samsung keypad devices—most notably the Samsung Guru series (Guru Music 2, Guru 1200, Metro, etc.)—are legendary for their durable hardware, straightforward proprietary operating systems, and massive battery life. However, like any embedded electronic system, long-term operation can lead to software glitches, memory heap saturation, forgotten lock passwords, sluggish menus, or continuous restarting loops ("boot loops").

For service technicians, mobile repair professionals, and end-users, master diagnostic strings (MMI and USSD codes) provide a fast, software-free method to restore internal registers to original factory defaults.

What Does the *2767*3855# Code Do?

In Samsung’s proprietary keypad firmware architecture, *2767*3855# is designated as the Full Factory Reset (EEPROM Master Wipe) command.

• Partition Reconstruction: The phone reinitializes the file allocation table within the embedded NOR/NAND flash memory.

• Master Lock Bypass: If the phone has a user-defined Phone Lock password, Privacy Protection lock, or Keypad Lock code preventing access to system menus, executing this string directly clears the security flags and resets passwords back to default (0000 or 00000000).

• Cache & Transient Register Purge: Temporary network registration tables, accumulated SMS indexes, and damaged heap memory caches are completely discarded.

• Autonomous Execution: Unlike menu-based resets, entering this exact dial string triggers an automatic hard restart sequence without asking "Are you sure?".

Pre-Reset Requirements & Verification Checklist

Before dialing low-level service strings, ensure the device environment meets these operational standards:

1. Remove the SIM Card: Eject both SIM 1 and SIM 2. Some cellular network operators block specific dialed strings, or the SIM application toolkit (STK) may intercept dialed USSD patterns.

2. Remove the MicroSD Card: To avoid inadvertent file index corruption during sudden power drops, take out any external memory cards.

3. Check Battery Voltage: The battery must hold at least 50% charge (or show at least 2 full bars). If the battery dies mid-reflash during the EEPROM erase cycle, the boot sector may become corrupted, requiring a hardware box reflash (e.g., Z3X or Miracle Box).

4. Stable Battery Connection: Ensure battery terminal pins are clean and tight so the battery does not shift loose during the reboot phase.

Step-by-Step Reset Procedure

Follow these sequential steps to perform the wipe and cycle the boot phase properly:

1. Power on the Device Insert a charged battery and press the Red (End Call/Power) key until the Samsung splash screen appears. Allow the phone to reach the main home screen or emergency dialer screen.

   • Verification: The main wallpaper, clock, or "Insert SIM" notification is visible.

2. Access the Dial Pad If prompted with an Emergency Call screen due to a lock, open the keypad dialer. If already on the home screen, type directly onto the keypad.

   • Verification: Number inputs appear clearly on the screen.

3. Enter the Master Reset Code Carefully dial:

   Plaintext

   *2767*3855#
   

   As soon as the final # is typed, the device will immediately change screens. Do not press the Green (Call) button.

   • Verification: The display will show a system message such as "E2P Full Reset", "Please Wait", or an animation indicator.

4. Observe the 1-Minute Reboot Cycle Leave the device completely untouched on a flat surface for 60 seconds (1 full minute).

   • The screen will go blank or turn solid black/white.

   • The internal processor erases the data block and rewrites factory registers.

   • The phone will power off entirely and initiate a cold boot automatically.

   • Verification: The phone plays its startup chime, flashes the Samsung model logo, and enters the initial Language & Date setup wizard.

Diagnostic Reference Table: Common Samsung Master Codes

Code Type	Dial Sequence	Function / Technical Action	Data Impact
Full Master Reset	*2767*3855#	Complete EEPROM reformat; removes user locks	Total Erase (Permanent)
Custom / Soft Reset	*2767*2878#	Resets UI and custom system settings to default	Retains most user files; clears cache
Firmware Version	*#1234#	Displays AP/CP software version and PDA release	Read-only (Zero impact)
Hardware & Software Test	*#0206*8378#	Opens internal test menu, audio gain, LCD test	Diagnostic only
Battery Status	*#0228#	Shows real-time ADC battery voltage, temp, and level	Read-only
Factory Engineering Menu	*#0*#	General test mode (keypad, speaker, display check)	Hardware testing

Troubleshooting Common Post-Reset Scenarios

Scenario A: Phone Displays "Emergency Only" or Blocks the Dial String

• Cause: The current security lock profile on the phone prevents entering standard USSD codes.

• Resolution: Power down the unit. Remove the SIM card entirely. Power on without a SIM. If prompted with an "SOS" or "Emergency" soft-key, select it to expose the dial field, then input *2767*3855#.

Scenario B: The Phone Stays Completely Blank After 1 Minute

• Cause: Insufficient battery voltage dropped the processor into a low-power shutdown mid-execution.

• Resolution: Pull the battery out for 10 seconds. Reinsert the battery, connect the micro-USB/charging pin, ensure the charging animation appears, charge for 20 minutes, and power on manually.

Scenario C: Device Still Asks for a Password

• Cause: Certain modern revisions of Spreadtrum/RDA chipsets used in newer budget keypad devices do not support legacy SysOL/Agere MMI codes.

• Resolution:

  1. Try the universal soft reset code: *2767*2878#.

  2. If the prompt asks for standard reset security pins via Settings, try standard defaults: 0000, 00000000, or 1234.

  3. If still locked, the device must be interfaced via USB using flashing tools (such as SPD Flash Tool or dedicated service dongles) to write a clean PAC/BIN firmware image