@Douglas-Kryder You don't have to do anything special.

Connect to the Omega2’s Serial Console
Switch the Power Off
Press the RESET BUTTON and hold down (it's called "I. Programmable button" on Omega2 LTE, see Board Features - Front)
Switch the Power On
Release the RESET BUTTON

This will get you to the bootloader (UBoot) menu and you have 40 seconds to choose one of the options.

Please select option:
[ Enter ]:
[ 0 ]: Start Web recovery mode. -> Firmware Flashing With Web Recovery Mode
[ 0 ]:
[ 1 ]:
[ 2 ]:

or

Please select option:
[ Enter ]:
[ 0 ]:
[ 1 ]:
[ 2 ]: Flash firmware from USB storage -> Firmware Flashing from USB Storage