Macbook Pro, Summer 2012, ML 10.8.2 problem After the latest EFI Update

I have an ssd as my main hdd. ML 10.8.2, and also a bootcamp partition.
I saw that an update was available for the efi firmware.
i updated and immediately afterward, my laptop froze!
I restarted, but now i couldnt boot into ML any longer. Havent been able to, ever since.
I used a Mountain Lion install DVD/USB, still no bueno. All I've been getting is first the grey apple logo with the "working" circle below it,
then i get the solid grey circle with a slash through it indefinitely.
I booted in verbose mode and i got the Waiting for root device" error, even when using dvd, and usb devices with mountain lion install burned onto them.
These media work and boot up on my older macbook by the way.
Finally, i decided to use internet recovery, and after 8 hours on a painfully slow internet connection, It booted into the network recovery.
I checked HDD using disk utility, All is well! the ssd shows as mounted and healthy.
Repair disk shows NO ERRORS.
Repair Permissions shows NO ERRORS.
and all through this, my BOOTCAMP still works 100%. I can boot into windows and all my ram, devices, etc show just fine!!
HELP ME! cuz I cant even reinstall ML as only internet recovery works and that could take a day or two to download and run.
Im considering undoing the EFI firmware update but i dont know how.

Apparently, the USB install Disk was not properly formatted. Which is why I couldnt boot from it.
But there was no indication so i couldnt have known! I just randomly decided to recreate it and voila! No need for internet recovery.
However, after reinstalling, once in a while, i still get that waiting for root device. I Blame EFI!
It's a good thing that I rarely restart my MBP anyways

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