To fix the dead hang logo issue on your Vivo Y1s 2015, you'll need to download the correct flash file. Here are the steps to follow:

The device shows no sign of life, fails to enter recovery mode, and only registers as a "MediaTek USB Port" when connected to a computer.

is a popular budget smartphone powered by the MediaTek MT6765 Helio P35 chipset. Like many Android devices, it can encounter serious system errors over time. Issues like getting stuck on the boot loop (), failing to turn on completely ( Dead Boot ), or software corruption can make the phone unusable.

Ensure all partition checkboxes (preloader, boot, system, userdata) are fully loaded and ticked. Step 4: Execute the Flash Command

The bypass tool will log a successful connection and release the device's secure COM port. Phase 4: Executing the Firmware Flash

Update your tool to the newest edition or select a custom DA file ( MTK_AllInOne_DA.bin ).

Secure the verified Vivo Y1s V2015 Factory Scatter File.

If the phone is "dead" (won't turn on or enter recovery), you must flash the stock firmware using a PC. Required Tools SP Flash Tool (v5.2020 or newer) and MCT Bypass Tool to bypass the MediaTek BROM security. Flash Files