A standard consumer account (e.g., Gmail) usually does not have download permissions. You typically need a company email or an account authorized by a Huawei partner.
: Use the "Superadmin" credentials (often different from the sticker on the back, such as telecomadmin admintelecom System Tools : Navigate to Maintenance Firmware Upgrade : Select the file and wait. Huawei Hg8145v5 Firmware Download