If Deep Test fails, you must use the EDL (Emergency Download) mode with a patched firehose loader—advanced users only.
Disclaimer: We are not responsible for bricked devices, lost IMEIs, or thermonuclear war. This post is for educational purposes. Always verify your device model (1801 = Y71) before flashing.
These are ROMs taken from a similar device (often the Redmi 8 or another Snapdragon 439 device) and "ported" to the Vivo 1801 by modifying the system files. vivo 1801 custom rom
Custom ROM installation wipes your internal storage. Copy photos, WhatsApp folders, and documents to your PC. Use adb backup or Google Drive.
Unlike Xiaomi or OnePlus, Vivo does not officially provide bootloader unlock tools for the 1801. Historically, developers used exploits (like the QFIL test point method or MTK Bypass) to unlock the bootloader on the Snapdragon 626 variant. If Deep Test fails, you must use the
Before dreaming about LineageOS or Pixel Experience, you must face Vivo’s biggest enemy: .
Because proprietary device trees for the vivo 1801 can be difficult to build, many developers rely on GSIs. A GSI is a system image that works on any Android device with Project Treble support (which the vivo 1801 supports). Always verify your device model (1801 = Y71) before flashing
menu. This is the first step to allowing custom modifications. Unlock the Bootloader
For a budget device from 2018/2019, the Snapdragon 439 is a capable but entry-level processor. As apps have become heavier and Android versions have advanced to 11, 12, and beyond, the hardware struggles to keep up with the manufacturer's heavy software skin (Funtouch OS). This hardware limitation is the primary reason users seek custom ROMs—specifically lightweight ones like LineageOS or Pixel Experience—to reduce lag and extend battery life.
Unlike Xiaomi or OnePlus, which allow users to unlock the bootloader relatively easily (sometimes with a simple toggle in settings), Vivo has historically maintained a "locked down" ecosystem. The bootloader on the vivo 1801 is locked by default, and for a long time, there was no official method provided by the manufacturer to unlock it.