Can't access to SSH and GUI after upgrade F5 Big-IP i4600 from image 14.1.0.3 to 14.1.2.6

Hi all,

we are having the issue is when we upgrade F5 Big-IP i4600 from image 14.1.0.3 to 14.1.2.6, we can't access to SSH and GUI for management. We connected to F5 by console cable but we can't access to device by local user account, It can't display password field for we type the password string to login. please guide me how to fix this issue.

Many thanks!