card2brain flashcards
v608 · 8.3 MB · code 6080
Verify you're human
Solve this to start the download.
File information
UpdatedFeb 26, 2026
PublishedJul 12, 2021
Packagech.openconcept.c2b
Versionv608 (6080)
Size8.3 MB
MD5aa82fb2eae357a8acf6dced425031aca
Min SDK22
Malware scanTRUSTED
Signature SHA175:0A:4E:85:BD:38:2B:1C:37:34:AC:97:2A:D9:5B:2C:EA:46:5A:DB
SignerCN=card2brain.ch, O=openconcept Ltd
Total downloads100,000
This version100,000
Developeraliok
Age ratingEveryone
What's new in v608
Android Update
Security scan
TRUSTED
- Developer signature verified 2026-02-26
- Signature SHA1 75:0A:4E:85:BD:38:2B:1C:37:34:AC:97:2A:D9:5B:2C:EA:46:5A:DB
- File MD5 aa82fb2eae357a8acf6dced425031aca
How to install card2brain flashcards v608 on Android 5.1 Lollipop+
Takes about 2 minutes. You'll need roughly 8.3 MB of free storage.
- Grab ch.openconcept.c2b_6080.apk — hit the Download button above (8.3 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 aa82fb2eae357a8a…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find ch.openconcept.c2b_6080.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=card2brain.ch, O=openconcept Ltd. 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 card2brain flashcards — tap Open on the install screen, or find the card2brain flashcards icon in your app drawer.
Common install errors for card2brain flashcards
- "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 5.1 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.