Sometimes the error is a one-time USB handshake glitch.
is the board configuration code. The "2" prefix sometimes appears in error logs due to a parsing error or a specific firmware branch. In official Apple IPSWs, this board is simply d11ap . The error "2d11ap" often appears when a tool incorrectly reads the device's ECID or board configuration from a corrupt or partial dump. loader for iphone9 2d11ap not found better