Macbook Air 13" MD232 Downgrade

Good morning.
I bought my Macbook Air MD232 3 weeks ago and it had factory installed Mac OS X Lion. I decided to upgrade up to Mountain Lion via special Apple code for AppStore. Than I noticed that I don't like it and I decied to downgrade. I tried to boot into recovery but the recovery disc's firmware had changed from Lion to Mountain Lion.
Yes, I used special Apple utilities to create a bootale flash drive with Lion and install it but I failed to do that. I know I could make a bootable drive with Lion before I upgraded but I don't know why I didn't.
Is it possible to downgrade to Lion?
Any way, thank you for help.
PS: Sorry for my English I'm not a native speaker

Your Mac is compatible with Internet Recovery, so press Command, Option and R keys while your Mac is starting. This will download the original Recovery HD that came with your computer, so you will be able to install OS X Lion.
Before installing OS X Lion, back up all your files because you will have to erase the disk to install Lion. After starting into Recovery, open Disk Utility, select Macintosh HD in the sidebar, go to Erase tab and erase the disk. Then, close Disk Utility and install OS X Lion, so OS X 10.7.5 will be installed. Restore your files after installing Lion

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