Always eject your SIM card and MicroSD card from the modem before starting the update process to prevent data corruption.
Before downloading random files from the internet (a dangerous practice), you must understand the specific identity of your device. huawei+e303s1+firmware+update+free
Are you updating to for other networks, or to fix a specific bug ? Always eject your SIM card and MicroSD card
Updating the firmware of your Huawei E303s1 device is a straightforward process that can be completed for free. Here's a step-by-step guide: huawei+e303s1+firmware+update+free