How to get your Mi Band 4 Auth Key code

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The Auth Key is a secret code that is generated by the official app to be able to connect with Mi Band 4.
New generation watches like Mi Band 4, Mi Band 5, Mi Band 6, Amazfit Bip S, Bip Lite, Bip U, Verge Lite, Amazfit GTR, Amazfit GTS, Amazfit T-Rex, Zepp now requires the Auth Key code to work without official app installed.
Auth Key is required if you want get Notify App connect with your Mi Band 4 without having also official app installed. So, without it Notify App cannot work.
Since the release of recent firmwares, the Auth Key is required to get all features working on Notify, please read all details here New firmware limitations, what has changed

How to get your band Auth Key - freemyband.com Automatic method

Thanks to integration with freemyband.com, now you can get the auth key using Notify App without doing any other complicated steps, follow the tutorial:

  1. Install the official app and pair your Mi Band 4
  2. Be sure to use an email to do the login procedure on official app (do not use a social login like Facebook, Google, ...)
  3. Uninstall the official app without unpairing Mi Band 4
  4. Install the Notify app, and follow the initial pairing tutorial by selecting your Mi Band 4
  5. On the second wizard activity, you will be asked to input your Mi Band 4 auth key, press the Get button and choose the automatic method
  6. Follow the procedure by doing the login using the previous account (email+pwd)
  7. Done! Your Auth key will be insert automatically on Notify app, and you can finish the pairing procedure
  8. Hint: to maximaze your privacy, please register on official app by not using your primary email (for example search for a disposable email on google), this way you will never have to share your email

How to get your Mi Band Auth Key - freemyband.com Method

  1. Unpair band from official app
  2. Uninstall official app
  3. Hard reset your Mi Band from Settings menu (optional)
  4. Download and install the Mi Fit apk from freemyband.com
  5. Pair the band
  6. Uninstall the Mi Fit
  7. Done! Your Auth key has been stored on /sdcard/freemyband folder of your phone
  8. Continue with the pairing procedure of Notify App - How to pair Mi Band 4 on Notify App

How to get your Amazfit Auth Key - freemyband.com Method

  1. Unpair band from official app
  2. Uninstall official app
  3. Hard reset your Amazfit from Settings menu (optional)
  4. Download and install the Zepp apk version from freemyband.com
  5. Pair the watch
  6. Uninstall the Zepp
  7. Done! Your Auth key has been stored on /sdcard/freemyband folder of your phone
  8. Continue with the pairing procedure of Notify App - How to pair Mi Band 4 on Notify App

Freemyband method notice:
- If you reset your band (MAC address of band change) the Auth key need to be calculated again
- The mod apk is compatible with any firmware version installed on your band
- You can do this procedure with any phone (if your phone doesn't allow install apk outside Play Store, you can ask to a your friend to obtain your Auth Key code for you)

How to get your Auth Key - phone ROOT method

Original post from: freemyband.com

  1. Ensure official app is installed and paired correctly with your Mi Band 4
  2. Connect your phone to the computer
  3. Ensure adb is installed and working correctly (google adb install for more instructions)
  4. Open console command line on your computer
  5. Execute command: adb shell
  6. Execute command: run-as com.xiaomi.hm.health
  7. Execute command: cd data/data/com.xiaomi.hm.health/databases/
  8. Execute command: sqlite3 origin_db_ "select AUTHKEY from DEVICE"
  9. Now you have got your Auth key code

Replace com.xiaomi.hm.health with com.huami.watch.hmwatchmanager if you are using Zepp app