The /tmp/ folder suggests – the file may be deleted after a new version (1.4.9 or 1.5.0) is released.

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A: If the package name matches and the signature is consistent, yes – but dev builds often use a different signing key, preventing updates.

http://static-open.flashexpress.com/development/tmp/flashexpress-courier-release-v1.4.8.apk

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