Here are steps to set port to trunk mode:

1. After connected to switch with console
2. Enter configuration mode
Switch> enable
Switch# Configure terminal

3. Clear the port to default
Switch(config)# default interface gigabitEthernet 1/0/24

4. Set the port to trunk
Switch(config)# interface gigabitEthernet 1/0/24
Switch(config-if)# switchport mode trunk
Switch(config-if)# switchport trunk native vlan 1
Switch(config-if)# exit

5. Save settings
Switch# copy running-config startup-config

Steps to reset password for Cisco Catalyst Switches:

1. Connect PC with console cable
2. Unplug the power cable to the switch
3. Reconnect the power to the switch. Press and hold the Mode button while System LED is flashing green. After System LED turns amber and then solid green, release the Mode button.

If process followed correctly, the following message should be displayed:

flash_init
load_helper
boot

4.Enter these commands into the switch

Switch: flash_init
Switch: load_helper
Switch: dir flash:
Switch: rename flash:config.text flash:config.text.old
Switch: boot

5. Once the switch boot, answer NO to “Would you like to enter initial/system configuration dialog? [yes/no]:

6. Get into the privilege prompt
Switch> enable