📶 Vivo Y91 (1820) Unknown Baseband & Null IMEI Repair | Easy CM2 Method
Having trouble with your Vivo Y91 (1820) showing unknown baseband or IMEI null after flashing or a failed software update? You're in the right place! This guide helps you fix baseband errors, restore IMEI, and resolve no network or invalid SIM issues using CM2 MT2 Tool.
These tested and verified files will also help if your device is stuck on the logo or not detecting the keyboard after reset. Read the full guide carefully and follow each step to bring your phone back to life.
📥 Download Required Files
🛠️ How to Fix IMEI Null & Baseband Unknown using CM2
- Launch CM2 MT2 Tool and enable "Custom DA" in settings.
- Load the DA & preloader files provided above.
- Go to Extra → Memory Tool and click Init Device.
- Use the test point method and connect the phone via USB while shorting test point with GND.
- Once the partition list appears, right-click OEMINFO and select "Read". Save the file safely.
- Disconnect the device and reconnect it using test point again.
- Click on OEMINFO and choose "Wipe Selected". Wait until it's done.
- Now disconnect the phone, insert the battery, and power it on. Wait on the logo for 2–3 minutes.
- Skip the setup screen. You’ll now notice issues like no keyboard or IMEI showing null.
- Reconnect the phone again with CM2 → Memory Tool → Init Device using the test point.
- Under Partition Manager, double-click on OEMINFO.
- Select "Write Selected", then load the OEMINFO file you saved earlier.
- Click "Start". Once the write is complete, disconnect the phone and reboot. ✅
📌 Final Notes:
This method helps repair IMEI issues, network problems, and unknown baseband errors on Vivo Y91 (1820) without any box or paid tool. Make sure to use the correct test point and verified files to avoid further damage. All files shared here are safe and tested. 🔐