[How To] Return To Gingerbread And S-on

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  1. iowabowtech

    iowabowtech root@android:/ #

    Procedure last edited on 9/4/2012

    (Thanks to sdrawkcab25 for help with various procedures herein)

    Due to major changes to the radios and bootloader since HTC Dev was introduced, this thread is now mostly applicable to those who went s-off back in the day and used the Unrevoked method to root and aquire s-off. Also, this is only written for those wanting to go back to full stock and s-on which is generally NOT recommended unless you are returning a phone and want no evidence of root activities.

    Note: Your SD card MUST be formatted to FAT32 before proceeding, if downgrading your radio for s-on and/or using option #1. The PB31IMG files will not be recognized otherwise. If you have yet to format, remember that formatting wipes the card. Be sure to copy/move your SD contents to a safe place (PC desktop) and replace after the formatting process. I will not go into the procedure in this thread as it is easily found with a Google search.

    1.) Download the 2.2 (Froyo) factory rom:
    MD5: 31bb1611a0fa8197d447c0438426717e

    ** Once downloaded, rename zip file to PB31IMG.zip **

    (MD5 verification is done to ensure the file you downloaded is complete and it's integrity is entirely intact. Skipping this verification is not advised. If you have questions about how to verify MD5, please see post #2 of this thread).

    2.) Attach phone to PC with USB debugging on and in disk drive mode.

    3.) Access the SD storage and drag the PB31IMG zip file (still fully zipped) from the desktop onto the root of the SD card (any open area, do not place into a folder).

    4.) Swipe down notification bar on phone and change to charge only.

    5.) Unplug phone from PC and turn off phone.

    6.) Hold volume down while pressing power button to enter hboot.

    7.) PB31IMG.zip should be automatically recognized in hboot. Press volume up to continue with update. Do NOT interrupt.

    8.) When finished, reboot to stock 2.2 and verify the following information at Menu > Settings > About Phone:

    Android Version: 2.2
    Baseband Version:

    9.) Remove the PB31IMG.zip from the SD card because we are about to place another one on the card and we don't want to cause confusion with 2 files of the same name. You are now unrooted and on stock 2.2.

    Explanatory note:
    Ok, so the reason we went back to 2.2 is because it is still rootable using Unrevoked and because the 2.2 radio will allow the s-on file to be applied. So although it may seem odd at first glance, we now need to reroot using the original Unrevoked method, then apply the s-on file...

    10.) Reroot using Unrevoked which can be found here:
    unrevoked3 recovery reflash tool, v3.32

    This will root your phone and provide you with Clockwork recovery so we can flash the s-on file.

    11.) You can now proceed to flash the s-on file by visiting public:forever [RootWiki] where you can download the required file. Scroll down to the section labled "Installation Instructions", you'll see it there. Move the file to the sdcard (leave zipped and no need to rename it), then access your clockwork recovery to install using the options...Install zip from sd card > Choose zip from sd card. Then locate and install. No wiping of any kind is required when flashing this file.

    12.) You are now s-on but still rooted. So to remove root and get back to Gingerbread, acquire the following file (2.3.4 factory rom) and once again rename it to PB31IMG.zip, place on the sdcard and load from hboot (not recovery) using all the same steps you used above when downgrading to Froyo:

    MD5: 4b7e23b052520978dcd100f008880f82

    You are now unrooted, s-on and running Gingerbread 2.3.4. Because there were some later updates to the bootloader, you may still be prompted for an OTA update. Either accept it or just keep denying the update until the phone is brought in for return. It won't matter because you're still on stock with a clean bootloader.

    DIncNewbie, cputrdoc, cbtk18 and 43 others like this.
  2. iowabowtech

    iowabowtech root@android:/ #

    How to verify MD5 sum:

    There are several free programs to verify MD5. Doing so will ensure that the file originally uploaded matches what you downloaded and it has not been tampered with or modified. I use the following program, feel free to choose your own:


    Download to PC, run and install. From then on, right click on any downloaded file and choose "MD5 Calcualtor". This will generate the MD5 for the given file.
  3. Beatlesfan

    Beatlesfan Well-Known Member

  4. tbeas

    tbeas Well-Known Member

    Nice guide. This is exactly how to unroot and go back to stock everything.
  5. Beatlesfan

    Beatlesfan Well-Known Member

    It did indeed fix my force close issues. Thank you very much!
  6. will_

    will_ New Member

    Finally got my rooted 2.2 back to stock tried everything, formatting, new sd card. Used your restore file and an i am on my way back to factory!!!!
  7. Beatlesfan

    Beatlesfan Well-Known Member

    Glad to hear it worked out for ya!
  8. ACD168

    ACD168 Well-Known Member

    good write-up. should help some nooberoos
  9. thedaego

    thedaego Member

    How do I check the MD5 sum on the MD5 sum checker? ;) JK.

    Thank you for the post. Going to try this when I get home tonight.
  10. iowabowtech

    iowabowtech root@android:/ #

    Guess you just have to trust that one. I like the way you think tho. :D
  11. wayrad

    wayrad Well-Known Member

    This looks like a great guide, but is the 2.2 ROM image available anywhere besides Rapidshare...? :eek:
  12. Beatlesfan

    Beatlesfan Well-Known Member

    No idea. I had to get it off rapidshare. Took forever to.
  13. iowabowtech

    iowabowtech root@android:/ #

    IDK, I don't own a speedy server so if anyone wants to host it, that would be great.
  14. Beatlesfan

    Beatlesfan Well-Known Member

    No worries iowa, we appreciate your guide nonetheless. If someone would host it though, that'd be great. I've a feeling that this is going to be used a lot. :D
  15. thedaego

    thedaego Member

    I think there may be a typo in your 'kernel version'

    "Kernel Version:"
    should be Kernel Version:

  16. RNorgman

    RNorgman Active Member

    My PRI Version and PRL Version are both different.

    PRI Version 1.28_002
    PRL Version 51965

    This probably explains why my wifi will not make a connection. I can find a network and connect to it, but nothing can be accessed while wifi is on. What do we do to get these numbers correct with what they should be?
    And I think you mistyped the build number CL231334 not CL23131334.
  17. Ethiopia

    Ethiopia New Member

    Hey all, I need a bit of help please.

    Will this method restore me to Froyo with all my settings/apps intact, or will this give me a clean wipe running on 2.2 clean of all settings and applications? Ever since I upgraded my Incredible to 2.2 via OTA, I've been getting tons of force closes of the core processes and applications running very laggy and slow. I liken the OTA update to a Vista to Windows 7 upgrade...it is going to slow down the entire system much more than a clean wipe would. So I'm looking for a way to go to 100% clean Froyo and reinstall all my apps/settings from there. I rooted my incredible with unrEVOked and I'm currently S-Off on 2.2 with a reflashed radio to the most recent version. I'd love to stay on the official HTC 2.2 because I love the calendar widget with my google calendar and the Microsoft Exchange widget/app support.

    Any suggestions?
  18. wayrad

    wayrad Well-Known Member

    Oh, I see - didn't mean to whine, it's just that I'm on dialup at home and Rapidshare won't allow an interrupted download to be resumed, and camping at Starbucks until the window of opportunity opens may be problematic...;) Thank you for the instructions though, they are much appreciated.
  19. iowabowtech

    iowabowtech root@android:/ #

    Wow, could I have jacked up the specs any more? :D

    @thedaego and RNorgman

    Edits made. I'm leaving off the PRI and PRL b/c I think they vary by location. PRL is the whole *228 update towers deal right? Probably kinda dumb of me to put that in there but after about 4 beers, it seemed like a good idea at the time.
  20. iowabowtech

    iowabowtech root@android:/ #

    Dialup!?! :eek:

    Yeah that would not even be feasible. Even on a moderate speed broadband it takes awhile to load 169MB.
  21. iowabowtech

    iowabowtech root@android:/ #


    Your settings won't be intact. It's a clean stock 2.2 install.
    Ethiopia likes this.
  22. Ethiopia

    Ethiopia New Member

    Thanks man! Great walkthrough, highly appreciated.
  23. RNorgman

    RNorgman Active Member

    Not a problem. I believe that you are correct about the PRI and the PRL. I just did *228 and my PRL was just updated. However I still have a problem with my WiFi, does anyone have any ideas to fix it?
  24. sdrawkcab25

    sdrawkcab25 Well-Known Member

    Sticky this please...nice write up
  25. Beatlesfan

    Beatlesfan Well-Known Member

    +1 Sticky please!

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