If your phone won't turn on or show the Nokia logo and then dies, flashing version 8.75 can often recover it.
You will need a standard Micro USB cable and a computer running Windows. Download Links & Requirements
To install version 8.75, you need the firmware files (often called "flash files") and a service tool.
Resolves issues like the phone hanging, freezing, or being stuck in a boot loop.
Flashing will erase all data, including contacts, messages, and photos. Move important files to a microSD card or back them up using Nokia PC Suite .