If your Osmose is stuck during the calibration part of the booting process, then the data saved in its flash memory got corrupted. Usually, there is no way around performing a factory reset to unblock the situation. This will delete all your user data, but since a user data backup to your computer is the first step of every regular firmware update process, you should be able to restore at least some of it.

To access the factory reset option, you will first need to boot in 'safe mode', which avoids loading the corrupted flash memory.

1. Press and hold the first menu button (the one that usually opens the presets menu) while you switch on Osmose.
2. Once the system is booted, press the "m" button (mode button) to access mode selection screen.
3. Press the 4th Value Encoder to open global settings ⚙️
4. Scroll to hardware tab with the Tab Selector in the upper left.
5. Scroll to 'factory reset' with Value Encoder 1 below the screen and push to trigger the reset. Confirm with "yes" (press Value Encoder 4).
6. Once the factory reset was completed, restore your user data with OsmoseUpdater -> Advanced Mode -> Restore User Data. Find information on where to find your backup data on the last page of the firmware update instructions. Alternatively, you can use OsmoseUpdater -> Advanced Mode -> Push Osmose Factory Collection to transfer the factory data by selecting the current *.osmoseupdate firmware file.