Cast Beta Hubandroid setup

CAST Android private beta setup

CAST downloads as an APK file. Open the downloaded APK, install it, then set up the local model from inside CAST.

First check the phone type. These steps are only for Android phones. If the tester has an iPhone, use the iPhone beta page; iOS cannot install APK files.
  1. Tap Download Android APK.
  2. Open cast-v76-private-beta.apk from the Chrome download notification, Chrome menu > Downloads, or Files > Downloads.
  3. If Android blocks the install, allow installs from Chrome or Samsung Internet.
  4. If Android says App not installed, uninstall any old CAST beta, then open the APK again.
  5. Open CAST, create an account with email verification, and complete the short setup flow.
  6. Use Model setup to download the small default .litertlm model. If a supported Gemma model is already in Downloads, use Import model file and choose it from Android's picker.
  7. Start with one real problem and confirm the app returns the read, the risk, and the next move.
  8. Open Tools, export a brief, and send beta feedback before calling the install complete.

Simple tester version

Use this if someone says they downloaded it but cannot find what to tap next.

  1. Open Chrome on the Android phone.
  2. Go to https://beta.castbystella.com.
  3. Tap Download Android APK.
  4. Wait until the download finishes. Do not tap the same download button over and over.
  5. If a download bar or notification appears, tap Open.
  6. If nothing opens, tap the three dots in Chrome, tap Downloads, then tap cast-v76-private-beta.apk.
  7. If it is not in Chrome, open the phone's Files app, open Downloads, then tap cast-v76-private-beta.apk.
  8. If Android asks whether Chrome can install unknown apps, tap Settings, turn on Allow from this source, then go back and tap Install.
  9. If Android says App not installed, uninstall the old CAST beta first, then open the APK again.
  10. Open CAST after install, enter an email address, then enter the verification code from that inbox.

Model setup

Use the small default LiteRT-LM model for first launch. Wider beta builds reject stronger model files until Cast publishes exact hashes and device gates.

  1. Download the default model from CAST's Model setup while on Wi-Fi.
  2. Android manages the large model download. Keep CAST open if you can; if the screen sleeps, reopen CAST after the download notification finishes and tap model setup again to verify.
  3. If support gave you the approved default `.litertlm` artifact, save it in Android Downloads.
  4. Open CAST.
  5. Open Model setup if the model is missing.
  6. Tap Advanced: import model and choose gemma3-1b-it-int4.litertlm from Downloads.
  7. If the model download fails, check free storage, reconnect Wi-Fi, then retry before importing manually.
  8. Send a short test problem and confirm the app no longer says the local model is missing.

If it still will not download or install

  1. Make sure the tester is on Android, not iPhone.
  2. Use Chrome if Samsung Internet or another browser is acting strange.
  3. Delete duplicate failed downloads so they do not tap the wrong old file.
  4. Check storage. CAST needs room for the APK plus the local model download.
  5. Uninstall any older CAST beta before installing v76.
  6. Restart the phone and try the download one more time.
  7. If it still fails, send a screenshot of the exact Android message and the phone model.

Permissions

No sensor permission should be required at launch. Camera, mic, location, files, watch, and optional context signals are requested only when the tester taps the related tool or opts in during setup. Private Mode keeps selected sessions out of durable memory.

Rocket watch toolbox

The watch is optional. It should send approved capture/control events to the phone. It should not run the main conversational model.