Gave an error while updating the firmware

Hello everyone..My Peugeot application said there was an update.. I downloaded the files to a USB and installed it.. I started installing the update in the evening.. I left the car running, closed the door and got out.. It gave an error towards the end.. I removed the USB and plugged it in again.. It gave an error towards the end again. I tried again and the same thing.. I turned off the engine.. It gave a Software on demand warning and this text remained on the screen before the old screen appeared.. Although I locked the car, the text and the screen did not go away and I waited for about half an hour and the screen was still on.. I disconnected the battery terminal.. I connected it after 3-4 minutes. The same screen remained.. The worst part is that I lock the car and the screen does not turn off.. I disconnected the battery terminal and came home. Does anyone know the solution?