Once the phone is in fastboot mode, check the connection status: fastboot devices Use code with caution. Unlock the bootloader using the standard fastboot command: fastboot oem unlock Use code with caution.

Here's a concise draft you can use for a forum post, README, or distribution page about a custom ROM for the Vivo 1801.

Installing a custom ROM replaces Vivo’s proprietary Funtouch OS with a clean, open-source version of Android (AOSP). The benefits for the Vivo 1801 are substantial:

Finding dedicated ROMs is difficult, but there are paths to explore:

This article is for educational purposes. The author and platform are not responsible for bricked devices, lost IMEIs, or data loss. Always research your specific Vivo 1801 sub-model (check Settings > About Phone > Software Version ) before proceeding.