1
How does a phone downgrade from 64-bit lollipop to 32-bit Kitkat can hardbrick the device?

  1. 0verlord
    Gingerbread Apr 24, 2015

    0verlord , Apr 24, 2015 :
    Hello all OnePlus Fellows,
    I was looking for something when I found this link on Yu Forums. http://forums.yuplaygod.com/threads/announcing-the-yu-beta-testing-program.6348/

    I'll quote the pertinent part of it :


    "3." is a pity actually. But it is "2." I don't understand. Can anyone explain the reason for such. On some other websites dealing with Yu phone upgrade to Lollipop, they happen to mention the same warning without reasoning. It is a request here. :)


    Note:- I know its not a Yu Forum here. But I'm not asking Yu related help. I'm only asking for the reasoning.
     

    #1
    Bharat droid likes this.
  2. siocnarf13
    Jelly Bean Apr 24, 2015


    #2
  3. rs98
    Ice Cream Sandwich Apr 24, 2015

    rs98 , Apr 24, 2015 :
    Yeah 64/32 bit is the processor not software lol idk why they'd write that
     

    #3
  4. prstorero
    Jelly Bean Apr 24, 2015

    prstorero , Apr 24, 2015 :
    Because of a bootloader change. That's the reason for bricking. They obviously have no idea what they're talking about with 32 bit vs 64 bit.

    edit: For some reason I thought this was about Oxygen :p
     
    Last edited: Apr 24, 2015

    #4
  5. scrivz69
    Jelly Bean Apr 24, 2015


    #5
  6. 0verlord
    Gingerbread Apr 24, 2015

    0verlord , Apr 24, 2015 :
    But CM 12 also has a different bootloader. I bricked my OPO when I used fastboot zip of CM 12. They could create a fastboot type Lollipop update and so as for Kitkat, if your reasoning is correct.
     

    #6
  7. 0verlord
    Gingerbread Apr 24, 2015

    0verlord , Apr 24, 2015 :
    I failed to understand what's funny. That I don't know this, or that the warning itself is stupid. I fear both :)
     

    #7
  8. Laamapalmu
    Jelly Bean Apr 24, 2015

    Laamapalmu , Apr 24, 2015 :
    Either the CPU or the Software side is stupid and wont work with each other in 32-bit.
     

    #8
  9. Lingering
    Ice Cream Sandwich Apr 24, 2015


    #9
  10. prstorero
    Jelly Bean Apr 24, 2015

    prstorero , Apr 24, 2015 :
    Just because it's different doesn't mean it isn't compatible. For some reason I actually thought this was about Oxygen since that's the only cases I've seen with bricking on this device.
     

    #10
  11. jove39
    Ice Cream Sandwich Apr 24, 2015

    jove39 , Apr 24, 2015 :
    You should be able to flash kitkat with factory image...not sure why they can't support it.
     

    #11
  12. 0verlord
    Gingerbread Apr 24, 2015

    0verlord , Apr 24, 2015 :
    More than the support to offer, they in fact mentioned that the device will be hard bricked!
     

    #12
  13. Jedipottsy
    Donut Apr 24, 2015

    Jedipottsy , Apr 24, 2015 :
    The Yu Phone has a snapdragon 615, which is a 64bit chip (totally useless), kitkat doesnt support 64bit, so is 32bit. Lollipop does, so the cm12 update for that device is 64bit. I would suspend they have to flash a certain part of the chip to enable 64bit support on the radio/chipset, which is un-reverseable, therefore not possible to downgrade.

    Just had a thought, the bootloader might be updated to a 64bit version, and in doing so would be unable to boot a 32bit kernel. Not sure why fastboot flashing the previous version wouldnt be possible however....
     

    #13
    0verlord and scrivz69 like this.
  14. scrivz69
    Jelly Bean Apr 24, 2015


    #14
  15. mskhalek
    Cupcake Apr 25, 2015


    #15
  16. xoqes88
    Jelly Bean Apr 25, 2015

    xoqes88 , Apr 25, 2015 :
    Dude, you created a thread asking exactly the same thing. And it was answered there.
     

    #16
  17. Bharat droid
    Gingerbread Apr 25, 2015

    Bharat droid , Apr 25, 2015 :
    as it was said,,it may brick the device, i think somebody should give it a try... because the guarentee replacement for bricked devices
     

    #17
  18. shoujinz
    Froyo May 1, 2015

    shoujinz , May 1, 2015 :
    Will it brick my phone if I just try to install KitKat as a custom ROM while on the Lollipop?
     

    #18
  19. 0verlord
    Gingerbread May 1, 2015

    0verlord , May 1, 2015 :
    If you flash a fastboot type ROM on OnePlus One, it wouldn't do that. The problem is unique for Yureka device.
     

    #19
    shoujinz likes this.
  20. return.of.octobot
    Jelly Bean May 1, 2015

    return.of.octobot , May 1, 2015 :

    If you have to ask, then probably.
     

    #20