Huawei firmware files are not easy to find. Huawei don't publish firmware files on their website, but there are some third-party filrmware archive websites where you can find selected firmware versions.
These archives are usually premium and require paid subscription, but some of the files are available for free.
Here are the links for these archives:
easy-firmware.com - mostly premium files
combinefile.com - lots of free firmware files
trustoff.ru - free firmware files
3ginfo.ru - free firmware files
androidhost.ru
firmwarego.com
Most firmware files (including premium) are re-uploaded to 4pda.ru forums, where you can download them for free. You'll have to register to download files, otherwise Error 404 is shown.
https://4pda.ru/forum/index.php?showforum=922
Some of firmware files could be found on Huawei update server:
https://gist.github.com/ValdikSS/f0f0d5ab9444b74ffedb7a41572bbbb5
I've reuploaded some of them:
ftp://serv.valdikss.org.ru/Downloads/Huawei_Firmware/
Full firmware archives contain release notes PDF file with device hardware and software information. This file includes LTE bands supported by the device and/or modification, Balong platform version, RAM/ROM amount, Wi-Fi chip and other useful information.
Wi-Fi chipset information and supported bands could be also found on Wi-Fi Alliance website (type device model into top right search box).