Optimum: f. r. s.

Name: Optimum: f. r. s.
Availability: InStock
Author: OPTIMUM: field reporting system

v3.21.2 · 42.1 MB · code 885

4295b06f9d4fa483d1e268dc1eb15e0d TRUSTED

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UpdatedNov 30, 2025

PublishedSep 27, 2021

Packagecom.optimum3.client

Versionv3.21.2 (885)

Size42.1 MB

MD54295b06f9d4fa483d1e268dc1eb15e0d

Min SDK21

ABIsx86, x86-64, armeabi, armeabi-v7a, arm64-v8a, mips, mips64

Malware scanTRUSTED

Signature SHA17A:DD:27:71:3A:06:C8:E6:93:38:61:F6:8A:30:DB:C2:2F:07:D5:D6

SignerCN=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, C=US

Total downloads50,000

This version50,000

DeveloperOPTIMUM: field reporting system

Age ratingEveryone

TRUSTED

Takes about 2 minutes. You'll need roughly 42.1 MB of free storage.

Grab com.optimum3.client_885.apk — hit the Download button above (42.1 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 4295b06f9d4fa483…. Any difference means the file is corrupted or tampered — delete and re-download.
Open the APK — tap the download notification, or find com.optimum3.client_885.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=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, 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 Optimum: f. r. s. — tap Open on the install screen, or find the Optimum: f. r. s. icon in your app drawer (this build targets x86/x86-64/armeabi/armeabi-v7a/arm64-v8a/mips/mips64 devices).

Common install errors for Optimum: f. r. s.

"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 5.0 Lollipop 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/armeabi-v7a/arm64-v8a/mips/mips64 native code. Devices with a different CPU will reject it.