On this page, I have shared the firmware file for Network unlock or Remove SIM lock from Vivo Y91, Y91i, and Y91c with free Firmware File. I have shared the how-to guide for using this file with sp flash tool.

If you’ve bought a device bundled with a mobile SIM plan, chances are it’s carrier locked. This means you’re restricted to using only that specific network carrier with the device. If you attempt to insert a SIM card from another carrier, you’ll encounter a message indicating that the Vivo device is locked. Below, we outline how to resolve the SIM carrier lock issue on Vivo Y91, Y91i, and Y91c models.

The NZO Tool is a software that is used to work on any Android Smartphone running Android Lollipop 5.0, Marshmallow 6.0, Nougat 7.0, Oreo 8.0, Pie 9.0, Android 10 Q, Android 11, Android 12, Android 13. It is also compatible with the latest Android 14 version. The software app is Compatible with Microsoft Windows 7, 8, 10, and 11 OS with both 32-bit and 64-bit arc.

This tool is user-friendly and using the tool functions is easy and simple, Just Install setup.exe and open the software on your computer, log in with required credentials if required, choose the required function format or FRP then connect your phone via a good USB cable in boot mode (EDL/Vcom/MTP mode). The tool will detect your phone unlocked within a few minutes.

How to Install and Use

Here are the steps to download and use the Vivo Y91, Y91i, Y91c Network Unlock Flash File and SP Flash Tool on your computer:

• Download the Vivo Y91, Y91i, and Y91c Network Unlock Flash File and SP Flash Tool to your computer.
• Extract all the files using either WinRAR or 7zip.
• Open the Flash tool folder.
• Download the Vivo Y91, Y91i, and Y91c Network Sim Unlock File for free.
• Run SP_Flash_tool.exe.
• Select the Vivo Y91 Y91 Y91c DA File.
• Click on “Choose” from the Download-Agent file Tab and select the Vivo_Y91_DA.bin file.
• Select the Network Unlock Scatter file.
• Next, click on “Choose” from the Scatter-Loading File Tab and select the MTXX_Android_scatter.txt file.
• Click on “Download.”
• Click on “Download” to start the flash for Vivo Y91, Y91i, and Y91c.

• Power off your Vivo Android phone.
• Connect your device to the computer via a USB cable.
• Open Device Manager and check the COMPORT Number.
• The flashing procedure will start for Vivo Y91, Y91i, and Y91c.
• The device will be detected, and the flashing process will begin.
• It will take some time to finish.
• Once finished, disconnect and power on your phone.

• Insert a SIM card and check if you have successfully unlocked the carrier lock from Vivo Y91, Y91i, and Y91c devices.
• That’s it!