: There are no widely recognized, stable "device-only" ROMs for the Y1s on major forums like XDA Developers .
To help you get started with the flashing process, let me know: Have you already ? Do you have a custom recovery (like TWRP) installed? Which Android version are you hoping to upgrade to? vivo y1s custom rom
Download a trusted (such as the MTK Bypass utility by Kamarush or similar open-source tools). : There are no widely recognized, stable "device-only"
: There is no official "one-click" method from Vivo. Some third-party tools like UnlockTool have been reported to work on its MediaTek MT6765 chipset , but these are not for beginners. Which Android version are you hoping to upgrade to
Since the Vivo Y1s launched with Android 10, it supports Project Treble . This means users can technically flash GSIs (Generic System Images). However, this requires a workaround to unlock the bootloader, which often involves paid authorized accounts or specific MediaTek exploit tools (like MTK Client).