Post Summit switch upgrade to 15.5 session stuck on login page

[Narender_kumar]

admin@KASR01> telnet routing-instance OM_CN 10.82.48.196
Trying 10.82.48.196...
Connected to 10.82.48.196.
Escape character is '^]'.

telnet session telnet1 on /dev/ptyb1

login: narender
password:

not goin post login via oss it stuck on login page



even direct login is working fine...



please confirm if faced such problem..

[Narender_kumar]

direct telnet from P2P link on port is working fine ... even after degrade we are able to telenet node...

now treid again , it stuck into bootrom mode...