Download LYF Water 9 LS 5006 flash file, Stock rom or firmware
Lyf_LS5506_MT6753_5.1_08052016 (Credit to Uploader)
SP Flash Tool : Quick Points
LYF Water 9 LS 5006: Use Firmware Upgrade in SP Flash tool to Reset FRP
Try to use Firmware Upgrade option to initialize Flashing.
While, loading Firmware in SP Flash tool.
Untick Preloader, which held responsible for Mobile life. If this file get corrupt, your LYF Water 9 LS 5006 will be dead.
Make sure to install Mtk driver to make communication between Mobile & PC (Flash tool)
While, installing Stock ROM. If the process get interrupted, it will result in Android logo with exclamation mark.