OOS Firmware Extractor is an open-source (MIT) Android app by c4ffein. The APK we host is 1.7 MB, it needs API level 20 or newer, and it declares 1 permission.
The file on this page is OOS Firmware Extractor 0.3.0, 1.73 MB, and it installs on API level 20 and newer.
We compared the signing certificate of this build with the certificate recorded the first time fr.witchdoctors.c4ffein.oosfirmwareextractor entered the site, and published both the file's SHA-256 and the certificate's fingerprint above so you can check the download yourself. That comparison says the file was not repackaged by someone else; it is not a review of what the app does.
The manifest inside the APK declares 1 permission, none of which cover contacts, location, SMS, the camera or the microphone.
Its licence is MIT. We took this build from F-Droid, and the source for this exact version is linked below.
The most recent release upstream is from Mar 18, 2019, over 7 years ago. It still installs; it is simply not being updated.
We do not show a star rating or an install count for this page: we have no measured figure for either, and a number we cannot source is worth less than an empty field.
- Version
- 0.3.0
- Size
- 1.73 MB
- Requires Android
- API 20
- Package
- fr.witchdoctors.c4ffein.oosfirmwareextractor
- Signature checked on
- Sep 21, 2026
- Where this file came from
- F-Droid
- Licence
- MIT
- Source code
- Source for this version
File SHA-256: 2a51840f3e76ea0f83c51bf62fe1adb6152e6cbeebe491a55fc6305470ae0db0
Signing certificate (SHA-256): 77aeea7bd076759fac474447413affa6ea66349a649e5c34cddc709c8c13ed2b
We check that this file carries the same signing certificate as earlier releases of the same package. That shows the APK was not repackaged by someone else — it is not a security review of the app.
Declared permissions
- WRITE_EXTERNAL_STORAGE
