Need root method for lyf water 7

Hi,

tired all all in one root kits but i was not succeeded in rooting my lyf water 7. so can some one help me in rooting this phone

here is some info about lyf 7

phone name: ls-5504
nubia ui: 3.0.1
processor info msm8939
build number: lyf ls5504_1.17
os 5.1.1


Could you please help in in rooting this device.

Thanks

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