How to put your blu mobile device "phone" into download mode

[Takiyah Beggs1]

Hey guys,
ii have a blu studio 5.0 ll and i cannot get it into download mode .. i've tried vol- and power button, vol+ and vol - together with power button and i've tried volume - power and home screen but still nothing happened . it just put me to factory recovery screen ..
pleaseeeeeee helpppppp ..