FKR
v5.2.1 · 3.6 MB · code 521
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File information
UpdatedNov 15, 2025
PublishedJul 21, 2023
Packagede.fkr.mobile
Versionv5.2.1 (521)
Size3.6 MB
MD554a6c489c201468fc2cfccc45777c4d9
Min SDK24
Malware scanTRUSTED
Signature SHA13A:30:C1:EB:A6:34:AD:D4:B5:E9:5E:50:A0:F8:3D:29:29:01:68:C3
SignerCN=Alex Kemmer, O=Cordes & Grafe KG, L=Stuhr, C=DE
Total downloads1,000
This version1,000
DeveloperGC-GRUPPE
Age ratingEveryone
Security scan
TRUSTED
- Developer signature verified 2025-11-15
- Signature SHA1 3A:30:C1:EB:A6:34:AD:D4:B5:E9:5E:50:A0:F8:3D:29:29:01:68:C3
- File MD5 54a6c489c201468fc2cfccc45777c4d9
How to install FKR v5.2.1 on Android 7.0 Nougat+
Takes about 2 minutes. You'll need roughly 3.6 MB of free storage.
- Grab de.fkr.mobile_521.apk — hit the Download button above (3.6 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 54a6c489c201468f…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find de.fkr.mobile_521.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=Alex Kemmer, O=Cordes & Grafe KG, L=Stuhr, C=DE. 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 FKR — tap Open on the install screen, or find the FKR icon in your app drawer.
Common install errors for FKR
- "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 7.0 Nougat 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.