Dying Light on PlayStation 4 Glitch on copying weapons. (Dying Light)

One friend helped me with this glitch, just yesterday, I won't shine on his nickname, but I know that he is on the Playground.
So: we put everything in the player's cache, except for two things (one required for copying, the other with the required amount - skill 15). Then we go to the seller and choose to sell a thing of which there is a lot. Click on the PS button, go to the settings - Network - Connect to the Internet - uncheck - check the box - return to the game. We are returned to the sales dialogue. Press the X button on the controller and select the item to copy. The previously selected item will be displayed in the sale dialog. Further, everything seems to be clear, all the step-by-step screenshots under the spoiler:

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Good night, Good luck!