This post provides Firmware Huawei E5372 21.236.03.00.58 (Optimus Portugal), which can be downloaded from the link which is provided at the end of the post. Once downloaded, extract in a folder using unzip software, and process as mentioned in the respective post. Wrong firmware/software change of a Huawei / ZTE, modem/router, may dead your device permanently. While running the Huawei firmware update, it will prompt for firmware/flash code as the password. You can generate the firmware code from universal master code tool.
Disclaimer: Administration of routerunlock shall not be liable if an unknowing change of your modem/router/MiFi firmware. Moreover, if you want any specific firmware related to Huawei dongle / Pocket MiFi, leave a comment; it will be published if it is available. All the firmware publicly posted at routerunlock is free of cost, and there is no need to pay anyone.