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

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juan413

Member
Feb 6, 2010
26
0
Springfield, MA
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 passimg.zip 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.

Steps:

1. Transfer the provided passimg.zip 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.
 
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juan413

Member
Feb 6, 2010
26
0
Springfield, MA
@ 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.
 

asero

Senior Member
Dec 1, 2009
346
8
Singapore

juan413

Member
Feb 6, 2010
26
0
Springfield, MA
@ 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.
 

ebuyer27

New member
Jul 4, 2010
1
0
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.
 

Marine6680

Senior Member
Jul 12, 2009
1,479
201
Kingsport TN
I have tried this and several files to downgrade, none worked. I wonder if the fact I used the "universal" 85b update that flashes the whole device.
 

juan413

Member
Feb 6, 2010
26
0
Springfield, MA
I don't think that is the problem because I myself used frf85b universal after doing the steps posted above and then rooted successfully following the how to root nexus one without unlocking the bootlowder tutorial.

Sent from my Nexus One using XDA App
 

sogo87

Member
Jul 3, 2010
22
1
I've got unrooted nexus and it's at&t's version.
will this Downgrade method work for me?
Is there any risk in it?
tnx!
 

juan413

Member
Feb 6, 2010
26
0
Springfield, MA
To be honest, I don't know if it will work on an at&t nexus because I don't have one, but it should work on it if the epe76 nexus rom is compatible with it.

Sent from my Nexus One using XDA App
 

nicdub

Member
Mar 27, 2009
32
0
Could I get a download link to the universal 85b zip to do this please. The Google download is not working it shows that the file is not found. Would appreciate it very much
 

pvillasuso

Senior Member
Apr 16, 2007
1,940
815
If his guide helped you, please consider buying him a beer.

Why ?

Is he ( juan413 ) a dev or something, why ask for money for this "guide" ..?

and @ebuyer27 .. LOL ?

Join Date
4th July 2010
Total Posts
1

and donation "on the way" ... Yeah Right ! ! ! Maybe he "donated" himself ... LMAO

SO BUSTED ...

donation goes to > [????@gmail.com[/email]

Watch out guys ! ! !
 
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N3xt2N0N3

Senior Member
Aug 17, 2007
434
3
Brooklyn
www.doughboydesigns.com
You could feel however you like about giving a donation. Its not a demand and I was only helping him out by having the links clickable since he was unable to do so.
 
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    i was able to downgrade no problem now it will not let me upgrade to 85b or other 2.2 verisons it says


    e: cant open/ cache/recovery/command
    E: failed to open /sdcard/update.zip (no such file or directory)
    E:signature verification failed

    Are you using the universal 85b?