Did you already decide that the OP has all the necessary tools? ;-)
No, I didn't. I know almost nothing about OP's system. (OP has an Omega2+. Full stop. / Period.)
So I asked "Please let us know what about the amber LED (ie. can your Omega2(?) perform a successful boot)?".
Flashing, while probably the easiest and the most reliable recovery tool, is only useful if you have an expansion dock - it provides the usb and serial interfaces that you will require for the flashing process.
Firmware Flashing from USB Storage
As you know on the Omega2(+) side we will need the following HW ingredients:
So we can use the Expansion Dock and the Mini Dock out of the box.
The Arduino Dock 2 can be used - for example - with an external USB-to-Serial converter module / cable. (IMO this solution is much better than the onboard CP2102 chip.)
It's fairly easy to add these HW components to a Breadboard Dock or even a well powered bare-bone Omega2(+).
These modifications have already been discussed earlier on the forum many times.