No backup, iOS update failed, iPhone now in DFU mode and Apple Configurator 2 prompts to restore

Hi,

I'm on macOS Big Sur 11.6.5. Today I tried updating my iPhone 11 Pro from iOS 13.2 to 15.4.1 with Apple Configurator 2, which wasn't up to date. At the end AC2 displayed this message : "amrestoreerrordomain error 1 failed to handle data request message bad argument" and my iPhone was in DFU mode.

I then tried to update again with AC2 and got this message : "iOS restore is required for this iPhone. This device cannot be updated to the requested software ; would you like to restore the device instead ?" I updated AC2, restarted my Mac, put my iPhone again in DFU mode but I still got this message. I found these threads : https://discussions.apple.com/thread/250657211, 5 Bricked Apple Configurator Updated iPads - Apple Community so I updated another device with wifi to iOS 15.4.1 and then plugged in this device but I wasn’t prompted to update mobile device framework.

I don't have any backup so I'm wondering if I can update my iPhone or if I have to restore it. Also I may be able to revive it with AC2 but I don't know what would happen to my content.

Sorry for my English, I'm French.

Any help would be much appreciated.