RUB Mobile v3.12
APK · 5.9 MB · version code 31 · Android 7.0+ · uploaded Jul 12, 2026
- Signature matches the Google Play version Details
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File information
- Version
- v3.12 (31)
- Uploaded
- Jul 12, 2026
- Size
- 5.9 MB
- Requires
- Android 7.0+ (API 24)
- CPU support
- Any (no native code)
- Graphics
- OpenGL ES 2.0+
- Screen
- Small screens and larger
- MD5
- fd0929653611c79022a3b958c7a1f2cb
- Signing certificate (SHA-1)
- DF:05:12:97:84:6B:7C:D4:2D:D6:26:FA:56:BE:58:60:89:E1:DB:6F
- Signed by
- CN=Eric Denman, OU=Blackboard Mobile, O=Blackboard, L=San Francisco, ST=CA, C=US
- File name
- com-blackboard-android-central-ruhr-de-31-75623102-fd0929653611c79022a3b958c7a1f2cb.apk
- Package
- com.blackboard.android.central.ruhr_de
- Downloads (all versions)
- 50K+
- Age rating
- PEGI 3 · Everyone
What's new in v3.12
Enhancements
Permissions (13)
This version requests 13 permissions, 3 of them sensitive.
- Approximate location Sensitive android.permission.ACCESS_COARSE_LOCATION
- Camera Sensitive android.permission.CAMERA
- Precise location Sensitive android.permission.ACCESS_FINE_LOCATION
- Control vibration android.permission.VIBRATE
- Full network access android.permission.INTERNET
- Prevent the device from sleeping android.permission.WAKE_LOCK
- Receive push notifications com.google.android.c2dm.permission.RECEIVE
- Run at startup android.permission.RECEIVE_BOOT_COMPLETED
- Run foreground services android.permission.FOREGROUND_SERVICE
- Show notifications android.permission.POST_NOTIFICATIONS
- Use biometric hardware android.permission.USE_BIOMETRIC
- Use fingerprint hardware android.permission.USE_FINGERPRINT
- View network connections android.permission.ACCESS_NETWORK_STATE
Security & authenticity
Security rating: Trusted
Signing certificate
- Signature matches the Google Play version Checked by the source store on Jul 12, 2026.
- Certificate issued to “Blackboard” This is the certificate of the Google Play version.
Store checks
- Developer signature verified Jul 12, 2026
- Validated against Google Play Jul 12, 2026
- Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures. AAPKs doesn't scan files itself.
How to install RUB Mobile on Android 7.0+
You'll need about 11.8 MB of free space.
- Download the APK — tap Download APK above (5.9 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
- Open the file — tap the download notification, or open Files › Downloads and tap com-blackboard-android-central-ruhr-de-31-75623102-fd0929653611c79022a3b958c7a1f2cb.apk.
- Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
- Check the file (optional) — the MD5 of the downloaded file should be fd0929653611c79022a3b958c7a1f2cb. If it differs, the file is damaged or was changed: delete it and download again.
- Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
- Open RUB Mobile — tap Open on the install screen, or find it in your app drawer.
Common install problems
- “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
- “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 7.0+). Download it again, or pick an older version.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.