No response while doing upgrade (efw-upgrade)

[Guest]

[jackyy2k1]

I have followed the steps of upgrading the efw from 2.4.0 to 2.5.2. The steps as below:-
1) Login as root, type password.
2) Type efw-upgrade - come out no response.
3) Then, type efw-upgrade -s, appeared option 1 & 2 to choose.
4) Choosen option 1 (Production).
5) Prompt username: Type the valid username which received from endian. But, after ENTER, the screen is blank, no any updating status showed.

Please advise what is the potential issues.

Thanks.

[jackyy2k1]

Any helps out there?