Software602 Signer v3.7.1
APK · 43.9 MB · version code 34 · Android 5.0+ · uploaded Jul 15, 2021
- Same certificate as v5.1.0, which matches Google Play Details
Quick check before downloading
Answer this to unlock the download. It keeps automated downloaders away.
Compared with the latest version
The latest version is v5.1.0, uploaded Aug 28, 2025 — about 4 years after this one.
- Size: this file is 43.9 MB; the latest is 90.2 MB (46.3 MB larger).
- Android: this version needs Android 5.0+; the latest needs Android 8.0+. Use this one if your device runs an older Android release.
- The latest version asks for 1 more permission: Show notifications.
File information
- Version
- v3.7.1 (34)
- Uploaded
- Jul 15, 2021
- Size
- 43.9 MB
- Requires
- Android 5.0+ (API 21)
- CPU support
- ARM 32-bit, ARM 64-bit
- Screen
- Small screens and larger
- MD5
- 7bf52fcbd115e2f520f0d976b1114691
- Signing certificate (SHA-1)
- EE:95:24:B7:60:36:4F:DA:BC:DC:7E:54:4C:37:BE:FB:F1:03:ED:6E
- Signed by
- CN=Software602, O=Software602 a.s., L=Prague, ST=Czech republic, C=CZ
- File name
- cz-software602-signer-34-58652729-7bf52fcbd115e2f520f0d976b1114691.apk
- Package
- cz.software602.signer
- Downloads (all versions)
- 5K+
- Age rating
- PEGI 3 · Everyone
What's new in v3.7.1
* NTLM authentication support when logging in to FormFlow
* link to forgotten password recovery on the login screen
* update of external libraries
* fixed reported bugs and minor improvements
Permissions (20)
This version requests 20 permissions, 5 of them sensitive.
- Camera Sensitive android.permission.CAMERA
- Find accounts on the device Sensitive android.permission.GET_ACCOUNTS
- Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
- Read shared storage Sensitive android.permission.READ_EXTERNAL_STORAGE
- Record audio (microphone) Sensitive android.permission.RECORD_AUDIO
- Authenticate accounts android.permission.AUTHENTICATE_ACCOUNTS
- Control vibration android.permission.VIBRATE
- Flashlight android.permission.FLASHLIGHT
- Full network access android.permission.INTERNET
- In-app purchases (Google Play Billing) com.android.vending.BILLING
- K9 read attachment (custom) com.fsck.k9.permission.READ_ATTACHMENT
- Manage accounts android.permission.MANAGE_ACCOUNTS
- Nfc android.permission.NFC
- Run foreground services android.permission.FOREGROUND_SERVICE
- Service (custom) cz.software602.signertoken.service
- Use biometric hardware android.permission.USE_BIOMETRIC
- Use credentials android.permission.USE_CREDENTIALS
- Use fingerprint hardware android.permission.USE_FINGERPRINT
- View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
- View network connections android.permission.ACCESS_NETWORK_STATE
Security & authenticity
Security rating: Trusted
Signing certificate
- Certificate issued to “Software602 a.s.” This is the certificate of the Google Play version.
- Same certificate as v5.1.0, which matches Google Play v5.1.0
Store checks
- Developer signature verified Jul 15, 2021
- Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (3 other versions compared). AAPKs doesn't scan files itself.
How to install Software602 Signer on Android 5.0+
You'll need about 87.7 MB of free space.
- Download the APK — tap Download APK above (43.9 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
- Open the file — tap the download notification, or open Files › Downloads and tap cz-software602-signer-34-58652729-7bf52fcbd115e2f520f0d976b1114691.apk.
- Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
- Check the file (optional) — the MD5 of the downloaded file should be 7bf52fcbd115e2f520f0d976b1114691. If it differs, the file is damaged or was changed: delete it and download again.
- Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
- Open Software602 Signer — tap Open on the install screen, or find it in your app drawer.
Common install problems
- “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
- “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 5.0+). Download it again, or pick an older version.
- “App not compatible with your device” — this build contains native code for ARM 32-bit, ARM 64-bit only. Devices with other processors can't install it.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.