update -kkv does not update my header

[Sundeep]

I have a script that is used to merge / update the file. This is done
in 2 step process, where in first update command we ask CVS to ignore
the keywords and later in second  update command we ask to update the
header information.

As below:

cvs -f update -r 10 -kk file1

and then

cvs -f update -kkv file1

Functionality needed:
================
After the above two commands complete, file1 should be updated from
branch 10, and it must have $Header$ information. <$Header is only
keyword in file>

Result obtained
============
File is getting updated from branch 10. But Header is not updated. It
is shown as "$Header$", but  I need value in it.

anything wrong in my steps or my understanding of CVS