How I Enabled ADB on Locked Phones Using Secret Dialer Codes

🔓 How I Enabled ADB on Locked Phones Using Secret Dialer Codes 2025

Alright, so let me just say this straight — if you're someone who deals with Android phones that are locked, glitched, or just plain stuck, then you know the pain of not being able to enable ADB (Android Debug Bridge). And without ADB? You’re pretty much stuck with nothing but hopes and hard resets.

Now here's the thing: most people don't know this, but many Android phones have hidden dialer codes that can open internal settings or engineer menus — even before unlocking the screen. Yes, you read that right.

So I’ve personally used these codes in my workshop while working on stuck phones where:

• The screen was locked (but still functional)
• USB debugging was off
• Recovery or fastboot wasn’t helpful yet

Here’s the actual list of codes I keep on my wall — and yes, they’ve worked in real life.

✅ Working ADB Enable Codes for Locked Phones

📱 HUAWEI – *#*#2846579#*#*
This code brings up the Project Menu, and if the phone is not completely dead or frozen, you can access USB Settings → enable ADB directly. I’ve used this trick on a Huawei Y9 that had a PIN lock but the dialer was still usable.

📱 XIAOMI – *#*#6484#*#*
Trust me, this one’s a life-saver. Got into a Xiaomi Redmi 6A that was pattern-locked. Used this code, accessed the Hardware Test menu, and from there, you can sometimes trigger USB-related diagnostics. Doesn’t work on all MIUI versions though.

📱 VIVO – *#*#225#*#*
Tried this on a VIVO Y91. The phone was FRP-locked but I still managed to open this menu via dialer and toggle some internals. ADB toggle is a bit buried — so take your time in the menu.

📱 OPPO – *#899#

No stars, just hash. Works like a charm. On a locked OPPO A37, I typed this into the dialer and got direct access to Engineer Mode — no password, no tricks.

📱 INFINIX / TECNO – *#*#49#*#* or *#85#
These two Transsion brands are generous with backdoor codes. You’ll often find that even FRP-locked phones accept the code and give you access to basic engineering functions.

📱 ALCATEL – *#2886#
I’ve only tested this once, but it opened the Device Tool menu. Didn’t explore much, but some users claim ADB can be toggled from here.

📱 LENOVO – *#*#4636#*#*
It’s a bit more “standard Android”. Useful mostly for checking phone info and battery status, but on older versions, there’s an ADB toggle under testing settings.

📱 SONY – *#*#737378423#*#*

Ridiculously long code — but if you ever get your hands on a Sony device, give this one a try. Haven’t tested it lately, but old Xperia models responded to it.

📱 MOTOROLA – *#*#2486#*#*
Leads to CQATest. It’s not super straightforward, but there are options related to USB. Used on a locked Moto E5.

📱 HONOR – *#*#2345#*#*
Basically Huawei in disguise. Used this on a locked Honor 10 Lite. Got into the menu, and from there, USB options were visible.

📱 ONEPLUS – *#*#2346579#*#*
Rarely fails. On OnePlus 5 and 6, even with a screen lock, this brought up engineering menus without a fuss.

🔧 My Personal Case (100% Real)

I had a Xiaomi Redmi 9A come into the shop — locked, no USB debugging, and the customer forgot the Google account. Normally, I'd need to flash or do a deep bypass. But I dialed *#*#6484#*#*, and it brought up the hardware test menu. I went through a few menus and found "USB Configuration" — boom, switched it to ADB.

Next thing you know, I had ADB shell access, backed up data, and even removed the lock using some of my personal scripts. No flashing needed. No tricks. Just that one hidden code saved me.

⚠️ IMPORTANT REMINDERS:

• These codes work only if the dialer is accessible. If the phone is totally locked or damaged, you’ll need more advanced tools.
• Some models/carriers disable these codes.
• Always test carefully — don't change settings unless you know what they do.
• You can’t type these if the phone is PIN-locked and doesn't allow emergency or dialer access.

Final Words

Honestly, I’ve saved myself hours of work just by remembering and using these codes. If you work in repair, FRP bypass, or even just refurbishing phones — print this list and keep it nearby. You never know when one of these will save your day.

If you’ve got any more working codes or tricks, I’d love to hear them. This guide is just my personal experience — not copied from some tech site.

Stay safe, and keep fixing! 👨‍🔧📱