BangleJS2 : bricked?

Hello

I have a banglejs2 watch that worked fine until yesterday.

Now it won't let me do anything, it will always come back to the white screen with the mac address on it.
Bluetooth connection/connecting to IDE and https://banglejs.com/apps works fine but when I try to upload something, it will tell me :

"Uncaught Error: File already written with different data"

I tried

• Resetting
  
• Resetting without loading any code
  
• Deleting all code (which seems working)
  
  

then :

• Installing only the bootloader app from https://banglejs.com/apps
  ==> Uncaught (in promise) Unexpected response "Uncaught Error: File already written with different data"

• Cloning and uploading each file from https://github.com/espruino/BangleApps/tree/master/apps/boot using the IDE
  ==> Uncaught (in promise) Unexpected response "Uncaught Error: File already written with different data"

How can I do to use my watch again?

Thanks!

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