If you are currently using v36, v37, or even the unstable v40, here is why you must upgrade immediately.
To appreciate Version 41, we need context. spreadtrum imei tool v41 better
Dial *#06# on the phone's keypad to confirm that the network configuration has been successfully repaired. Troubleshooting Common Errors If you are currently using v36, v37, or
: Enter the original 15-digit IMEI number found on the device's sticker or box. If you are currently using v36