There are two primary ways to handle an update. For most users, the Web Management Page is the easiest route. Method 1: The Web Interface (HiLink Models)
Huawei never provided a generic updater for the E303s-1. Updates were distributed exclusively through like T-Mobile, 3 (Three), Smart, or Telcel. If you bought a locked dongle from a carrier, their firmware version is tuned to their specific towers. Huawei E303s-1 Firmware Update