This post provides Firmware Huawei E3372s-153 Update 22.300.09.00.00 Universal, which can be downloaded from the link 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 a password. You can generate the firmware code from the universal master code tool.

Disclaimer: Administration of routerunlock shall not be liable if you unknowingly change 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.
May I get the password to proceed?
IMEI = 868230036331944
868230036331944 Firmware Code = 56851711
blue download button is not linked, no redirect to download page, you can click forever
Updated
Error to search device
Install drivers first,
plz need unlock code for lte stick Huawei E3372 imei : 869907022882449
869907022882449
unlock code plz