Mastery
v2.1.1 · 11 MB · code 18
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File information
UpdatedMar 23, 2026
PublishedMar 23, 2026
Packagero.mb.mastery
Versionv2.1.1 (18)
Size11 MB
MD5a6d1f39c4846a47a987eab438ae1f674
Min SDK15
ABIsx86, x86-64, armeabi-v7a, arm64-v8a, mips
Malware scanTRUSTED
Signature SHA1A0:E7:ED:4A:BF:D7:51:A1:7C:2F:44:A7:1B:67:BC:99:B2:8B:93:98
SignerCN=Mihail Burduja, L=Bucharest, ST=Bucharest, C=RO
Total downloads100,000
This version100,000
DeveloperMihail Burduja
Age ratingEveryone
What's new in v2.1.1
* Fixed order issue when viewing activities for a skill/category.
* Added sorting options for skills.
* Increased skill limit to 7.
* Added sorting options for skills.
* Increased skill limit to 7.
Security scan
TRUSTED
- Developer signature verified 2017-11-24
- Scanned for malware 2020-11-28 09:21:37
- Signature SHA1 A0:E7:ED:4A:BF:D7:51:A1:7C:2F:44:A7:1B:67:BC:99:B2:8B:93:98
- File MD5 a6d1f39c4846a47a987eab438ae1f674
How to install Mastery v2.1.1 on Android API 15+
Takes about 2 minutes. You'll need roughly 11 MB of free storage.
- Grab ro.mb.mastery_18.apk — hit the Download button above (11 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches a6d1f39c4846a47a…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find ro.mb.mastery_18.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Mihail Burduja, L=Bucharest, ST=Bucharest, C=RO. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Mastery — tap Open on the install screen, or find the Mastery icon in your app drawer (this build targets x86/x86-64/armeabi-v7a/arm64-v8a/mips devices).
Common install errors for Mastery
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android API 15 or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.
- Works on one phone but not another — this build ships x86/x86-64/armeabi-v7a/arm64-v8a/mips native code. Devices with a different CPU will reject it.