O-Ring Master v4.0
APK · 8.1 MB · version code 8 · Android 4.0.3+ · uploaded Sep 17, 2026
- Signature matches the Google Play version 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 v5.0.2, uploaded Oct 2, 2026 — about 15 days after this one.
- Size: this file is 8.1 MB; the latest is 12.1 MB (3.9 MB larger).
- Android: this version needs Android 4.0.3+; the latest needs Android 6.0+. Use this one if your device runs an older Android release.
- The latest version asks for 1 more permission: Internal broadcast protection (app-defined).
- The latest version no longer asks for: View network connections, Get tasks, Modify shared storage.
File information
- Version
- v4.0 (8)
- Uploaded
- Sep 17, 2026
- Size
- 8.1 MB
- Requires
- Android 4.0.3+ (API 15)
- CPU support
- Any (no native code)
- Screen
- Small screens and larger
- MD5
- 8741d4307e2e59226d34675a6946f026
- Signing certificate (SHA-1)
- 72:8D:84:BB:EC:3E:75:8A:40:F2:FD:82:4F:38:B9:BB:2B:23:36:56
- Signed by
- CN=MasterHand, OU=MasterHand, O=MasterHand, L=Taipei, ST=TW, C=886
- File name
- tw-com-masterhand-oringmaster-8-76662477-8741d4307e2e59226d34675a6946f026.apk
- Package
- tw.com.masterhand.oringmaster
- Downloads (all versions)
- 10K+
- Age rating
- PEGI 3 · Everyone
What's new in v4.0
Regular maintenance and performance improvements.
Permissions (4)
This version requests 4 permissions, 1 of them sensitive.
- Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
- Full network access android.permission.INTERNET
- Get tasks android.permission.GET_TASKS
- 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 Sep 17, 2026.
- Certificate issued to “MasterHand” This is the certificate of the Google Play version.
- Same certificate as the 2 other versions checked
Store checks
- Developer signature verified Sep 17, 2026
- Validated against Google Play Sep 17, 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 (2 other versions compared). AAPKs doesn't scan files itself.
How to install O-Ring Master on Android 4.0.3+
You'll need about 16.3 MB of free space.
- Download the APK — tap Download APK above (8.1 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 tw-com-masterhand-oringmaster-8-76662477-8741d4307e2e59226d34675a6946f026.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 8741d4307e2e59226d34675a6946f026. 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 O-Ring Master — 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 4.0.3+). 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.