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[TIPS] Stuck On FRF91? Want To Downgrade To Get Root? Click Here!

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By juan413, Junior Member on 4th July 2010, 08:01 PM
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Hello to Everyone!

If you are like I was, stuck on FRF91 without being able to downgrade to get root, or if you just want to be able to flash to any earlier version Nexus One rom, then this post is for you.

FRF91 does not allow you to flash to just any earlier version rom so for this tutorial, we will be using the EPE76 rom that I have already renamed to which allows us to bypass this limitation. The steps provided in this tutorial are all done on a stock t-mobile Nexus one with a locked bootloader, this is especially useful for people who wish to use the rooting method without unlocking the bootloader. If you already have an unlocked bootloader, there is no reason to follow this guide.

"Update" confirmed to also work on at&t nexus one

Notice: after you do this you will have to redownload your apps.


1. Transfer the provided file to the root of your sd card.

2. Power down your phone.

3. Hold down the Volume Down button as you power your phone back on.

4. A screen should appear showing your phone’s system searching for various files. This will take up to 2 minutes.

5. The phone will ask you if you want to start the update. Press the Volume Up button to start the update.

6. If you followed these steps correctly, Congratulations, you are now on stock EPE76 Android 2.1 and able to flash to any official Nexus One rom that has been released.

If this guide helped you please let people know, the more posts there are, the more comfortable other people will feel to follow this guide.
4th July 2010, 09:19 PM |#2  
N3xt2N0N3's Avatar
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Just helping the OP out.

Link to the here

If his guide helped you, please consider buying him a beer.
4th July 2010, 09:43 PM |#3  
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Doesn't work.

'update failed - file is older!'
4th July 2010, 09:46 PM |#4  
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thanks for helping with the links.
4th July 2010, 09:47 PM |#5  
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4th July 2010, 09:51 PM |#6  
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@ Amdathlonuk

If you received that error, then it was not done correctly. I downgraded from FRF91 two times before posting the tutorial and it worked both times, please make sure to follow the guide 100% exactly as posted or it won't work. Thanks.
4th July 2010, 09:57 PM |#7  
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If you already have your bootloader unlocked, a very much simple approach that doesn't require you to downgrade to stock and erase all your data is this:

Except of course, you don't need to flash the radio (since you have it already in FRF91) and instead of flashing CyanogenMod, you would flash any repacked and rooted FRF91 like this one.
4th July 2010, 10:08 PM |#8  
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@ asero

This method is for people who don't necessarily want to unlock their bootloaders. Thanks for pointing that out, I have updated my posting.
4th July 2010, 10:15 PM |#9  
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OMG, I was stuck on frf91 for the past 3 days after manually updating like an idiot. You saved me from a lot of headaches. Very easy tutorial. Donation on the way. Thank You.
4th July 2010, 10:28 PM |#10  
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Thanks very much
4th July 2010, 11:07 PM |#11  
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Is EPE76 only for T-mobile phones or is it safe for ATT phones as well?
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