The Vivo 1801 is a capable device, but it has its limitations. By installing a custom ROM, users can:

Installing any custom ROM requires an unlocked bootloader. This is the first gate you must pass. For the Vivo 1801, users have reported immense difficulty in unlocking the bootloader, with many finding that no standard method works. In fact, one user on XDA Developers explicitly stated that they wanted to root their Vivo 1801, but "the bootloader is not unlocking by any method on the internet".

| Method | Process | Status for Vivo 1801 (Y71i) | | :--- | :--- | :--- | | | Register an account, apply for an unlock code, and use Fastboot commands. | Highly Unlikely: This official path is typically reserved for specific, newer Vivo models and is not available for budget devices like the Y71i. | | Fastboot Method | Use standard fastboot oem unlock commands in the bootloader. | Does Not Work: Reports from multiple users confirm that the standard Fastboot commands fail to unlock the bootloader on this model. | | MTKClient Method (for MTK devices) | Use a third-party Python tool to exploit a vulnerability in the boot ROM (BROM) of MediaTek chipsets. | Not Applicable: This method is for devices with MediaTek (MTK) processors. The Vivo 1801 (Y71i) has a Qualcomm Snapdragon chip, making this tool useless for it. |

In this guide, we will cover everything from compatible ROMs to step-by-step flashing instructions.

Before you start, ensure you back up all your data. Installing a custom ROM will erase all data on your device.

After testing multiple builds from the XDA community, here is a breakdown of the top 3 full packages.

Reboot your device. The first boot can take up to 10 minutes. Troubleshooting & Important Advice

Finding a "full paper" or academic study specifically on custom ROMs for the Vivo 1801 (Vivo Y71)

If your phone requires a deep raw-program flash due to a locked bootloader, acquire standard flashing software utilities like MiFlash or unified servicing tools. 🔓 Step 2: Unlocking the Vivo 1801 Bootloader

Since official support for the Vivo Y71 ended at Android 8.1 Oreo, custom ROMs are the only way to experience newer Android versions. vivo Y71 - Full phone specifications - GSMArena.com

There is (such as mainstream Android 10/11/12 builds) for this specific model. Most development for this device is restricted to "Port ROMs" or modified stock firmware.

Disclaimer: Flashing custom firmware voids your warranty and carries the risk of permanently bricking your device. Proceed at your own risk.

He picked up the phone, opened the browser, and typed a new search query, just for fun.

A custom ROM is a third-party operating system firmware built from the source code of Android. It completely replaces the phone's stock OS (including Vivo's FunTouch OS). Users seek them out for several reasons:

Perform a "Wipe" > "Advanced Wipe" and select Dalvik/ART Cache, System, Data, Cache.

(Last updated: October 2025 – confirms Android 14 builds are now semi-stable)