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Root from root to 2.1its

Discussion in 'Android Devices' started by jimigood, Jun 2, 2010.

  1. jimigood

    jimigood Member
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    I know dumb? But can't find a real answer. How do I go from root back to 2.1ota?
     

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  2. BlazeD OnE

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    Why would u ever want to do that!?, it should be the same as the instructions to go back to 1.5.. or maybe u can only go back to 1.5 idk..
     
  3. erisuser1

    erisuser1 Android Expert
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    If I were you I would look in the 4th Sticky Post at the top of this forum, one page down.

    I'm thinking it will be the part that with the heading

    "Full Downgrade from 2.1root (any) to 1.5 stock - FULLY WORKING"

    eu1
     
  4. erisuser1

    erisuser1 Android Expert
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    BlazeD OnE really does have a point.

    The instructions that I referenced are more technical and harder to execute than putting a rooted ROM onto your phone - one that will be almost always better than what you get with 2.1-OTA.

    Unless you are planning on returning the unit.

    eu1
     
  5. jimigood

    jimigood Member
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    I have read the sticky. So I know you can go back to 1.5. Just wasn't sure about going from 2.1ota, to root, back to 2.1ota. And FYI, never said I wanted to, just nice to know I can.
     
  6. majorpay

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    It'll probably come in real handy if you ever want to return the phone... It's good to know for future reference for sure. This has been one of my biggest concerns.
     
  7. thenestor

    thenestor Android Expert
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    Even if there's not a more direct way, you can downgrade to 1.5 and then flash the OTA update manually. Or just stay at 1.5 until you get an OTA update notice on your phone a day later.
     
  8. T2noob

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    Yea in order to go back to 2.1 OTA you need to have stock recovery so it would be easier to just go to stock 1.5 besides the Hboot and then have the OTA update it for you.
     
  9. jimigood

    jimigood Member
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    Yes one that understands!

    Thank all of you for the info. So how I understand it, I can go back to 1.5 then get the ota a second time.

    Not that I would want to, my phone has never ran better, but you never know if a may need to.
     
  10. erisuser1

    erisuser1 Android Expert
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    That's a single command given to the Amon_RA recovery boot via adb:

    adb shell flash_image recovery /sdcard/recovery.img

    Obviously, care needs to be taken that the "recovery.img" file on the SD card is the correct one, both in version and in checksum. ( adb shell (then) mount /sdcard ; md5sum /sdcard/recovery.img ; umount /sdcard ; exit )



    Pretty easy to do the whole return-to-1.5-stock-followed-by-OTA-2.1, if you have ROOT; as a matter of fact you can do everything needed from an adb shell to the Amon_RA recovery console.

    Just unzip the MR2 PB00IMG.ZIP (md5sum 9e9ad31f01bbcb05157443287f4f38dd), in there, the files needed are

    4bc51796c9353efcaeb688bfb2cf54da boot.img
    71a4b633bdb32de9dcdd8953fef43cdc recovery.img
    d3d36f3b9a12d791a79a8135ced07c8f system.img
    e0f6d36dfe808e00e3a5794158ec1a8c userdata.img


    For a tutorial, have a look at the action in nandroid-mobile.sh, put the above files on the SD card, boot in to Amon_RA and then

    [Attention noobs: if you are not familiar with Unix, you should not be using this. You have been warned.]

    Code (Text):
    1.  
    2. prompt-whatever> adb shell
    3.  
    4. / # mount /sdcard
    5.  
    6. / # for FIL in boot.img recovery.img system.img userdata.img ; do md5sum /sdcard/$FIL ; done
    7. / # echo I have checked the MD5 signatures and I know what I am doing
    8. I have checked the MD5 signatures and I know what I am doing
    9.  
    10. / # mount /system
    11. / # cd /system
    12. /system # rm -rf * >> /dev/null 2>&1
    13. /system # unyaffs /scard/system.img
    14. end of image
    15. /system # cd /
    16. / # umount /system
    17.  
    18. / # mount /data
    19. / # cd /data
    20. /data # rm -rf * >> /dev/null 2>&1
    21. /data # unyaffs /sdcard/userdata.img
    22. end of image
    23. /data # cd /
    24. / # umount /data
    25.  
    26. / # flash_image boot /sdcard/boot.img
    27. / # flash_image recovery /sdcard/recovery.img
    28.  
    29. / # exit
    30.  
    ... and reboot. The "Update is available" (OTA-2.1 notice) will appear on your phone before you have made it through the setup screens. That gives you a completely stock OTA-2.1 phone (plus a little trash associated with setup in 1.5, which could be easily wiped with a 2.1 FR); at that point, if you wanted, you could make a Nandroid backup of a completely stock OTA-2.1 phone.

    Here's a cool trick that other Android phone users know about, but Eris rooters never seem to use: the 1.49 S-OFF bootloader allows you to boot the Amon_RA recovery without ever installing it.. How do you do that, you say?


    Put the phone into fastboot mode and shove the thing across the USB for immediate booting:

    fastboot boot recovery-RA-eris-v1.6.2.img


    No need to flash over the 1.49 S-OFF bootloader for the OTA update, as you point out - it would be dangerous to do so anyway, because the OTA install re-flashes the recovery partition back to an HTC version for 2.1. I don't think the radio version matters either - it also gets flashed by the 2.1-OTA anyway. Neither the OTA nor the OS care about what they are during the 1.5 boot. (The 1.17.605.1 "stock" recovery must be in place before the OTA-2.1 runs, because the Amon_RA recovery boot does not process the OTA-2.1 update-script correctly.)


    eu1
     

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