Hello,
SW system startup bootrom, press "CTRL + B" whin 2 seconds, here need to enter the password to enter BOOTROM menu. The default password is asfollows:
1. S9300 V100R006 and the former version:9300
2. S7700 V100R006 and the former version:huawei
3. Box SW V100R006(except V100R006C03) and the former version:huawei
4. All series Ethernet SW V200R001、V100R006C03 version:Admin@huawei.com
Glad to help you! Any further questions, let us know.