Siemens SCALANCE S615 - Troubleshooting; Downloading new firmware using TFTP without WBM and CLI

Configuration
2.1 System
SCALANCE S615 Command Line Interface
Configuration Manual, 06/2015, C79000-G8976-C406-02
61
Result
The duplex mode of the interface is configured.
Further notes
You can reset the duplex mode of the Interface to the default value with the no duplex
command.
You disable autonegotiation with the
no negotiation command.
2.1.10.4
no duplex
Description
With this command, you reset the duplex mode of an interface to the default value.
The default value is
full.
Requirement
You are in the Interface configuration mode.
The command prompt is as follows:
cli(config-if-$$$)#
Syntax
Call the command without parameters:
no duplex
Result
The duplex mode of the Interface is reset to the default value.
Further notes
You configure the duplex mode of the interface with the duplex command.