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I have not been able to test for downgrading to GB from JB.All the same, I would like to warn you that Those willing to downgrade their Galaxy device to Gingerbread from Ice Cream Sandwich or Jelly Bean should not follow the method given here unless you have the firmware files with Bootloader or PIT.Wait a bit , Press F5 and ENTER Key when DVD loaded.4) Wait for some time.If you see installation screen, you are almost done.This occurs due to the difference in EFS location in newer and older Samsung firmwares.Several people who tried downgrading to Android 4.1 or 4.2 from Android 4.3 have reported this issue.We are always eager to upgrade our phone to the latest version so that we might enjoy the new features and apps that come with a new update.
To backup your EFS partition/IMEI, please refer to the following tutorial: How to Backup and Restore IMEI on Samsung Galaxy Devices Installing a firmware version that is lower than the current one is just the same as installing a higher one, but you have to do one more thing that you do not usually do.
While most of times we are happy with the new things introduced in an update, it also happens sometimes all our hopes are undone when we have to face a bug or lack of a favorite feature that we used to enjoy on an older firmware.
It happened to me a couple of weeks ago when I updated my Galaxy Note 2 to the Android 4.1.2 Jelly Bean firmware.
Finally, here are the steps on how to downgrade firmware on Samsung Galaxy devices.
I assume that you have already done as described above, so let’s go ahead.