You Can Use The Below Method For Upgrade Blu Studio G HD S170L Android 5.1 Lollipop
Download SP Flash Tool Newest SP Flash Tool is the very useful utility for fixing soft brick or boot loop cases, especially for the Media Tek devices. You could flash Stock or Custom ROMs of your choice.
Windows 10/Pro users: READ: How To Install MTK VCOM Driver On WINDOWS 10 (32 & 64 bits)
Download the Stock ROM For Blu Studio G HD S170L:-
Blu Studio G HD S170l Stock Rom Flashing With SP Flash Tool:-
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Next click on the “Scatter loading” button and locate the scatter text from the unzipped ROM earlier, as shown below:-
Now click the “Download” button and connect your device (in off state) to the PC or Laptop via USB Cable and immediately press Volume Up button momentarily, and your device will be detected accordingly and initiating the flashing process, as shown below:-
It will complete the flash process in a minute or so, and when it is complete and successful, you see the yellow full bar and a big check mark as shown below:-
Now, you can switch on your device.