Diag Enable Code New 2025 (All Brands)

Diag Enable Code New 2025 (All Brands)

Diag Mode (Diagnostic Mode) is a special function hidden inside most smartphones.
It lets service software like HCU, OptuPlus, QPST and others communicate with the phone.

This is often used for:

• IMEI repair
• Hardware testing
• Network unlocking

Below is a complete list of working Diag Mode codes for many popular brands.
You can open the diagnostic port without rooting or flashing your device.

Diag Codes

Brand / Model	Code / Steps	Extra Info
Huawei	##2846579## → Project Menu > Background Settings > Manufacture	Open port via HCU or OptuPlus
Vivo	*#585#, *#588#, ##558# → Quality Verification Test > Diagnostic Port	Works on most Vivo models
Motorola	Motorola Menu > Enable Diag [Factory Enabled]	May require service menu access
OnePlus	*#801#, *#8011# OR CDMA/LTE > Volte > OnePlus Open Diag Menu > Rndis, diag switch ON	Works on OxygenOS & ColorOS builds
LT Mobile	CDMA/LTE > Volte > LT Open Diag Menu	Used for CDMA/LTE testing
China Mobile	##717717##	Some models require engineering mode enabled
Samsung (Sprint)	##3424#	Opens Sprint Diag Menu
Samsung (Verizon/USC)	##3666333#	For Verizon & US Cellular models
Samsung (Others)	*#0808#	USB settings menu
Xiaomi / Redmi	##717717##, ##13491## OR Enable Diag in engineering settings	Works on MIUI-based devices
Lenovo	##8899##	Opens Lenovo service mode
ZTE	*#7678# OR Enable Hidden Menu: ZTEOPENEM# (983673636#) → Quick Pop-Up → 98387274#	Also via CDMA/LTE > Volte > ZTE Open Diag Menu
LG	Open Diag Menu OR *#546368#*model# OR ##7262626##	Sprint & other variants supported
OPPO	*#801# → Enable Engineer Mode Toggle	Works on ColorOS

📝 How to Use These Codes

1. Open your phone dialer.
2. Type the code exactly as shown.
3. If a menu opens, look for Diag Mode, USB Settings, or Engineering Mode.
4. Select the Diagnostic Port or similar option.
5. Connect your phone to your PC with a USB cable.

⚠️ Warnings & Tips

• Some codes work only on specific regions or carriers.
• Changing wrong settings may cause network or hardware issues.
• Always make sure IMEI repair or unlocking is legal in your country.
• For brands like Huawei and Xiaomi, you may need extra tools to fully activate the port.