Universal Book Reader v3.0.638
APK · 21.1 MB · version code 638 · Android 3.0+ · uploaded Jan 9, 2016
- Same certificate as v4.9.1605, which matches Google Play Details
Quick check before downloading
Answer this to unlock the download. It keeps automated downloaders away.
Compared with the latest version
The latest version is v4.9.1605, uploaded Jul 18, 2026 — about 10 years after this one.
- Size: this file is 21.1 MB; the latest is 19.2 MB (1.9 MB smaller).
- Android: this version needs Android 3.0+; the latest needs Android 4.0.3+. Use this one if your device runs an older Android release.
- The latest version asks for 4 more permissions: Run foreground services, Receive push notifications, Google Play install referrer, Read Google service settings.
- The latest version no longer asks for: Read phone status and identity.
File information
- Version
- v3.0.638 (638)
- Uploaded
- Jan 9, 2016
- Size
- 21.1 MB
- Requires
- Android 3.0+ (API 11)
- CPU support
- x86 32-bit, ARM (legacy)
- Screen
- Small screens and larger
- MD5
- fb22af0caf8f994053bc106e7f4641af
- Signing certificate (SHA-1)
- 39:24:E1:05:9F:20:B3:1D:87:2E:5A:54:59:5B:C8:C6:11:A3:E2:B8
- Signed by
- CN=Nikolay Kussovski, OU=Mobile Systems, O="Mobile Systems, Inc.", L=San Diego, ST=California, C=US
- File name
- com-mobisystems-ubreader-west-638-15991926-fb22af0caf8f994053bc106e7f4641af.apk
- Package
- com.mobisystems.ubreader_west
- Downloads (all versions)
- 10M+
- Age rating
- PEGI 16 · Medium Maturity
What's new in v3.0.638
Version 3.0.638
* Performance improvements
Version 3.0.607
* Localized in German, Spanish, Portuguese (Brazil), French, Russian, Italian, Dutch (Netherlands)
* Fixed bugs
Version 3.0.593
* Feedbooks.com online bookstore integration
Version 3.0.498
* Added ability to customize category cover images
* Added ability to change default book covers
Permissions (11)
This version requests 11 permissions, 2 of them sensitive.
- Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
- Read phone status and identity Sensitive android.permission.READ_PHONE_STATE
- Add home-screen shortcuts com.android.launcher.permission.INSTALL_SHORTCUT
- Alarm set alarm (custom) com.android.alarm.permission.SET_ALARM
- Control vibration android.permission.VIBRATE
- Full network access android.permission.INTERNET
- In-app purchases (Google Play Billing) com.android.vending.BILLING
- Prevent the device from sleeping android.permission.WAKE_LOCK
- Run at startup android.permission.RECEIVE_BOOT_COMPLETED
- View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
- View network connections android.permission.ACCESS_NETWORK_STATE
Security & authenticity
Security rating: Trusted
Signing certificate
- Certificate issued to “Mobile Systems, Inc.” This is the certificate of the Google Play version.
- Same certificate as v4.9.1605, which matches Google Play v4.9.1605
Store checks
- Developer signature not verified Nov 10, 2021
- Antivirus scan passed Jan 20, 2020
- Uploaded by “ricardowner” 251 followers · uploading since 2015
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself.
How to install Universal Book Reader on Android 3.0+
You'll need about 42.3 MB of free space.
- Download the APK — tap Download APK above (21.1 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-mobisystems-ubreader-west-638-15991926-fb22af0caf8f994053bc106e7f4641af.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 fb22af0caf8f994053bc106e7f4641af. 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 Universal Book Reader — 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 3.0+). Download it again, or pick an older version.
- “App not compatible with your device” — this build contains native code for x86 32-bit, ARM (legacy) only. Devices with other processors can't install it.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.