: Supports 4G LTE CAT4 with theoretical download speeds up to 150 Mbps and upload speeds up to 50 Mbps.

The filename was: B312-926_Update_10031H192SP9C00_UNIVERSAL.bin

The firmware version 10.0.3.1(H192SP9C00) is often sought as a "universal" or "global" version to unlock operator-locked devices (like those from Dialog in Sri Lanka) for use with other SIM cards. Key Firmware Details Version Number: 10.0.3.1(H192SP9C00).