AlterLock CycleGuardService

Gen2 Firmware Update Announcement (1.3.28)

We have released the firmware version 1.3.28 of "AlterLock Gen2 Device" as follows.

Update contents

Version 1.3.28

  • Fixed an issue where some devices would stop working after repeated periodic transmissions.
  • Fixed an issue that could cause false positives depending on the angle of the device when locked

How to update

  1. Firmware update must be performed with the USB cable connected and the red or blue LED lit.
  2. On the app's main screen, tap Advanced.
  3. Scroll to the bottom of the screen, and if the firmware version is less than "1.3.27", tap [Firmware Update].
  4. The firmware update takes about a minute to complete.


  • If an error occurs with the firmware update, unplug the USB cable, press and hold the button on the device for 10 seconds, and try updating again.
  • If the device does not reconnect after waiting 20 seconds after the firmware update is complete, press the button on the device for 2 seconds and tap the reload button in the upper right corner of the main app screen.
  • In the environment where multiple Bluetooth devices are connected at the same time, the update may fail in the middle. Please disconnect from other Bluetooth devices before trying to update.

We have also updated our iOS and Android apps. If you haven't updated yet, please update to the latest version from each store.

GET IT ON Google Play

Recent Updates

Version 1.3.27

  • Fixed the problem that the power consumption becomes high when positioning by GPS is repeated.
  • Fixed an issue where repeated Bluetooth connection and disconnection could cause the device to fail to reconnect.

Version 1.3.26

  • Fixed a bug that caused devices to freeze due to frequent Bluetooth disconnection and reconnection.
  • Shortened the time to reconnect to Bluetooth.
  • Solved the problem that the connection cannot be established in some models of Android 7.
  • Solved the problem that location information acquisition by Wi-Fi is not stable.

Version 1.3.25

  • The method of acquiring location information by Wi-Fi has been improved.

Version 1.3.24

  • Improved stability of reconnection.

Version 1.3.23

  • Improved the success rate of GPS positioning while moving. It improves the acquisition of position information in the situation that repeats moving and stopping.
  • Fixed a problem where the detection sensitivity "LOW" setting could cause false detection due to noise.
    The MID and HIGH sensitivity settings are the same as before, while the LOW sensitivity setting is designed for use on bike racks with horizontal swaying.

Version 1.3.22

  • Fixed an issue where the power consumption would not drop after certain operating conditions.
  • Adjusted the accuracy of static judgment after movement detection.
  • Faster processing for smoother first-time pairing.
  • Fixed a coordinate problem in GPS positioning in some overseas countries.