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 → 983*87274#	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

Open your phone dialer.
Type the code exactly as shown.
If a menu opens, look for Diag Mode, USB Settings, or Engineering Mode.
Select the Diagnostic Port or similar option.
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.