You will need to flash your phone with updated firmware always, otherwise, your phone will be going to die. Vivo Y15s firmware is available on several sites. We are publishing the latest firmware files always so you can download it without hesitation.
You can download the latest firmware of your phone from the provided links below. If download links are not working or you are unable to download find download links, please contact us, we will help you very soon. You will need to update your phone firmware for getting new features.
Model Name: Vivo Y15S
Firmware Size: 823MB