I want to publish an app for BlackBerry 10 but already have a version on the App World for the BBOS. Will the version that if targeted for BB10 overwrite the old version that was targeted for BBOS? How do I upload the BB10 version but keep both versions?
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When you upload an application, you have to choose the OS target for a specific release. It won't overwrite your current version if you select only QNX targets (BB10 and/or PlayBook). You can select a custom set of devices/OS version for each release.

Marc Plano-Lesay
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Question though, If i have a release for all BB10 models and I want to update Q10 and Q5 only, would that work that way? Will Z10 keep getting the old one? – Bojan Kogoj Aug 07 '13 at 17:17
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Yes, you can choose to make a release available only for specific devices (even for specific CPU across a same device). But the NDK provides way to package the same app for the Q10/Q5 and the Z10, you should take advantage of that and release only one package for all BB10 devices. – Marc Plano-Lesay Aug 07 '13 at 19:10
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Well so far I released the same for all, but I don't want Z10 to update if I make changes for Q5 and Q10 only. Some people hate downloads – Bojan Kogoj Aug 08 '13 at 08:57