2021 USPS Carrier Calendar
v4.21.20200630 · 4.9 MB · code 20200630
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File information
UpdatedJun 12, 2024
PublishedMar 21, 2023
Packagecom.fourcatsapp.colorcal2021
Versionv4.21.20200630 (20200630)
Size4.9 MB
MD55ec36ba2ff6cc0e98fc0cb1ad7ff5dae
Min SDK17
Malware scanTRUSTED
Signature SHA146:D0:25:46:89:61:DA:38:F6:D4:9F:FD:D2:46:78:AD:9B:EE:5A:2A
SignerCN=Preston Fung, L=Rocklin, ST=CA
Total downloads1,000
This version1,000
DeveloperFourCatsApp
Age ratingEveryone
What's new in v4.21.20200630
Added support for Android 10, removed support for Android 4.4 - 6.0 and minor edits.
Security scan
TRUSTED
- Developer signature verified 2024-06-12
- Signature SHA1 46:D0:25:46:89:61:DA:38:F6:D4:9F:FD:D2:46:78:AD:9B:EE:5A:2A
- File MD5 5ec36ba2ff6cc0e98fc0cb1ad7ff5dae
How to install 2021 USPS Carrier Calendar v4.21.20200630 on Android API 17+
Takes about 2 minutes. You'll need roughly 4.9 MB of free storage.
- Grab com.fourcatsapp.colorcal2021_20200630.apk — hit the Download button above (4.9 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 5ec36ba2ff6cc0e9…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.fourcatsapp.colorcal2021_20200630.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=Preston Fung, L=Rocklin, ST=CA. 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 2021 USPS Carrier Calendar — tap Open on the install screen, or find the 2021 USPS Carrier Calendar icon in your app drawer.
Common install errors for 2021 USPS Carrier Calendar
- "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 17 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.