Four By 21
v7.0 · 11.3 MB · code 44
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File information
UpdatedAug 29, 2025
PublishedMar 20, 2021
Packagenet.aharm.fourby21
Versionv7.0 (44)
Size11.3 MB
MD5a85ae8c5c2e7a486b667b2d498f07ee0
Min SDK26
Malware scanTRUSTED
Signature SHA189:CD:18:1F:BD:48:F5:4E:96:2B:ED:35:48:47:B9:F0:21:21:A5:BF
SignerCN=Alexander Harm, L=Medford, ST=MA, C=US
Total downloads50,000
This version50,000
DeveloperWords and Maps
Age ratingEveryone
What's new in v7.0
Third Party API Update
Android Build Version Update
Android Build Version Update
Security scan
TRUSTED
- Developer signature verified 2025-08-29
- Signature SHA1 89:CD:18:1F:BD:48:F5:4E:96:2B:ED:35:48:47:B9:F0:21:21:A5:BF
- File MD5 a85ae8c5c2e7a486b667b2d498f07ee0
How to install Four By 21 v7.0 on Android 8.0 Oreo+
Takes about 2 minutes. You'll need roughly 11.3 MB of free storage.
- Grab net.aharm.fourby21_44.apk — hit the Download button above (11.3 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 a85ae8c5c2e7a486…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find net.aharm.fourby21_44.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=Alexander Harm, L=Medford, ST=MA, C=US. 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 Four By 21 — tap Open on the install screen, or find the Four By 21 icon in your app drawer.
Common install errors for Four By 21
- "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 8.0 Oreo 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.