1.1.Please prepare an empty micro SD card, of which capacity is more than 128 Mbyte.
(You cannot use the 8G Micro SD card that came with the NX501E. If you do, it will void your warranty and you will need to purchase a replacement card.)
1.2.Please download "Latest-BT-Update(3.70.1).zip" file to your PC. A folder named "SW_Update" will be created.
If you do not currently have winzip installed you can download it here.
1.3.Please extract the file and copy "SW_Update" folder into the micro SD card.
2.Update (The NX501E screens below are the same as NZ501E.)
2.1.Please turn off the NX501E power with a long press of the volume button. Please turn off the NZ501E power with a long press of the MENU button.
2.2.Please insert the micro SD card into your NX501E.
2.3.Please press the volume button of NX501E, so you can see the screen below. Please press the MENU button of NZ501E, so you can see the screen below.
3.1.Please press the MENU button.