Hi,
I think for this product the password is Admin@huawei.com
The default password for these products is always in the dopcumentation and may change with different version so you can always check on line for the version of OS that you are using.
Unfortunately if you have changed the boot rom password and lost it there is no recxovery mechanism, the device will have to be returned to Huawei to have the EEPROM reflashed.
Regards Nigel