Enable Diag Mode On HyperOS 2.0 (Check it)

🔧 How I Fixed a Xiaomi IMEI Using This Hidden Diag Code (No PC Commands, No Root)

Okay, I gotta share this — if you work in mobile repair like me, you need to know about this trick. I was fixing a Redmi Note 13 Pro+ the other day (model: Garnet) and the IMEI was gone after some update mess. Normally, I’d use ADB to turn on Diag Mode, but USB debugging was off — classic headache.

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Then I remembered this code I saw online a while back:
👉 *#*#73694364#*#*

I didn’t expect much, but typed it into the dialer anyway. Not even joking — the phone instantly switched into Diag Mode. I checked Device Manager, and there it was: Qualcomm HS-USB Diagnostics 9008. Just like that.

💡 What This Code Does

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So basically, this is a hidden shortcut in Xiaomi devices running HyperOS 2.0. When you type *#*#73694364#*#* in the dialer, it silently enables Diag mode. No popup, no menu — it just works in the background.

Perfect for:

• IMEI Repair (QCN write)
• QFIL backup/restore
• Any operation that needs the diagnostic COM port

📱 Models I’ve Tested This On:

• Fuxi (Xiaomi 13)
• Ishtar (Xiaomi 13 Pro)
• Garnet (Redmi Note 13 Pro+)

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Worked on all three. Might work on others too, especially those running HyperOS with Qualcomm CPUs.

🔧 Real Use Case

Here’s what I did that day:

1. Opened the dialer
2. Typed *#*#73694364#*#*
3. Plugged into PC — port showed up
4. Loaded QCN in QPST, restored backup
5. IMEI was back in 3 minutes, no root, no flashing

Customer thought I was a genius. I just smiled 😎

⚠️ A Few Tips

• You need Qualcomm drivers on your PC
• Doesn’t work on MTK (MediaTek) models
• Use it responsibly — don’t touch IMEI unless you’re restoring a legit backup
• No need to press the call button — it triggers automatically

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Honestly, this little trick saved me a ton of time and frustration. If you do repairs, especially on Xiaomi devices, keep this code handy. Could save your day like it did mine.

🧠 Code: *#*#73694364#*#*
💬 Share this with other techs — not many people know about it (yet).