What To Do When Upgrading Version of The App

I' ve a BB App based on QNX. While upgrading version, BB World gave the following warning, although i' ve upgraded the version parameter in bar-descriptor.xml and in the name of bar file:
File bundle (udts_sistek-2_0_3_1.bar) has been rejected. Package ID is required for all .bar file. If this is an upgrade, Package ID must match Package ID in original file bundle.
Because of i haven' t got any keys which i used them to sign the previous release, i suppose that the only way is uploading new release as new application. Am i right? 
In addition what do i need for the next upgrade? Is backup file ('Preferences > Signing' in Momentics Ide) enough?
PS : I' ve read the following tag which is not reply to my question.
http://supportforums.blackberry.com/t5/Adobe-AIR-Development/File-bundle-has-been-rejected-Package-I...

Apple supply Samsung, Hynix, Nanya and Micron (which is Crucial) as standard, so any of these should work as if supplied by Apple. Samsung ram usually has a lifetime warranty - but it is always possible to get a faulty chip from any manufacturer. Shop around and work out the cost/benefit of buying from a 3rd party. Sometimes it pays to upgrade from 512mb to a single 1gb from Apple, sometimes it's cheaper to buy 2gb elsewhere and factor in the resale value of the original chip.
The 1gb Samsung chip is M470T2953CZ3-CE6
Good luck.
PS - FYI this question has been answered hundreds of times already in this forum.

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