Can't use Flash builder to generate an iOS release build for ARM64 only

Hi,

Have been searching on the web a few days for this issue. We need to generate a release build ASAP that supports only arm64, which means it will prevent users to install our app if their device is not for arm64.

We did use "UIRequiredDeviceCapabilities" to specify the limitation the in the description xml:

<iPhone>

        <InfoAdditions><![CDATA[

            <key>UIRequiredDeviceCapabilities</key>

                 <array>

                <string>arm64</string>

                 </array>

          ]]></InfoAdditions>

...

</iPhone>

However, when we submitted the build to iTunes, we got this error: Apps that have "arm64" in the list of UIRequiredDeviceCapabilities in info.plist must only contain the arm64 slice.

From our research, it seems that if we are using XCode, there is an option to select the architecture for arm64 only(xcode - How to submit an archive only for 64-bit iOS devices? - Stack Overflow ). But we are using Flash builder. How to make FB compile the code for arm64 only?

We don't use any ANEs. Just our own as3 classes. We are using Flash builder 4.6, and air sdk 24.

Thanks a lot for any tips!!!

Joy