V9.2.1 to 10.2.1 active/passive

I found this error as CR116950 which is later on fix but not sure why not working for 10.2.1 anyhow I replace it with BIGIP-10.2.2.763.3 which is working . every thing went well but strange Initially I am able to logged in as default password. but once I restart the hardware admin password is working on default while root password is not working as default so I change the root password ( mount -a ) following procedure save successfully but nor working :( drive me crazy :(