Serial USB Terminal v1.57
APK · 2.4 MB · version code 102 · Android 5.0+ · uploaded Feb 5, 2026
- Signature matches the Google Play version 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 v1.60, uploaded Jul 20, 2026 — about 5 months after this one.
- Size: this file is 2.4 MB; the latest is 1.6 MB (840.7 KB smaller).
- Both versions request the same permissions.
File information
- Version
- v1.57 (102)
- Uploaded
- Feb 5, 2026
- Size
- 2.4 MB
- Requires
- Android 5.0+ (API 21)
- CPU support
- Any (no native code)
- Screen
- Small screens and larger
- MD5
- 2b5336af487f7ea637d4874dd3d52f8a
- Signing certificate (SHA-1)
- FC:7B:CC:2A:E2:94:11:A2:A9:FB:08:6E:19:E1:C1:F0:DA:FF:FA:DB
- Signed by
- CN=Kai Morich, ST=Germany, C=DE
- File name
- de-kai-morich-serial-usb-terminal-102-73448685-2b5336af487f7ea637d4874dd3d52f8a.apk
- Package
- de.kai_morich.serial_usb_terminal
- Downloads (all versions)
- 500K+
- Age rating
- PEGI 3 · Everyone
What's new in v1.57
1.57 2025-11-07
FIX copy from main text view with unmodified spaces
INFO Android 5.0 as minimum version
1.56 2025-03-17
FIX single CR handling for newline CR+LF setting
1.55 2024-07-21
NEW flow control for FTDI, PL2303, CP210x
1.54 2024-06-02
NEW disable send button if send takes more than 0.2sec
FIX sending large data at very low baud rate caused 'connection lost'
FIX reduce CPU/battery usage when control lines are shown
1.53 2024-01-12
FIX improved notification enabling
Permissions (8)
This version requests 8 permissions, none of them sensitive.
- Foreground service connected device android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE
- Foreground service remote messaging android.permission.FOREGROUND_SERVICE_REMOTE_MESSAGING
- Full network access android.permission.INTERNET
- In-app purchases (Google Play Billing) com.android.vending.BILLING
- Internal broadcast protection (app-defined) de.kai_morich.serial_usb_terminal.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
- Run foreground services android.permission.FOREGROUND_SERVICE
- Show notifications android.permission.POST_NOTIFICATIONS
- View network connections android.permission.ACCESS_NETWORK_STATE
Security & authenticity
Security rating: Trusted
Signing certificate
- Signature matches the Google Play version Checked by the source store on Feb 5, 2026.
- Certificate issued to “Kai Morich” This is the certificate of the Google Play version.
- Same certificate as the 4 other versions checked
Store checks
- Developer signature verified Feb 5, 2026
- Validated against Google Play Feb 5, 2026
- 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 (4 other versions compared). AAPKs doesn't scan files itself.
How to install Serial USB Terminal on Android 5.0+
You'll need about 4.9 MB of free space.
- Download the APK — tap Download APK above (2.4 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 de-kai-morich-serial-usb-terminal-102-73448685-2b5336af487f7ea637d4874dd3d52f8a.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 2b5336af487f7ea637d4874dd3d52f8a. 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 Serial USB Terminal — 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.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.