How to downgrade from JB to ICS???

Discussion in 'Lenovo IdeaTab A2109' started by iszabo, Jan 9, 2013.

  1. iszabo

    iszabo Member

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    Hi,

    I have horrible battery life with JB about 30 hours max screen off time before battery drain on both official JB and MCL201. I tried in CWM to dowgrade to older MCL but no luck the device won't boot.

    Thank you.
     
  2. Ravak

    Ravak Member

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    You need an ICS bootloader, ICS clockwork (version C) and obviously ICS ROM. I don't remember the exact procedure, but it goes like that:
    1. Install ROM using clockwork version d (JB one) - at that time it won't boot.
    2. Install ICS bootloader - should boot now, but clockwork won't work anymore.
    3. Go to fastboot and flash older clockwork (version C).

    ICS Bootloader (courtesy of mcl630): https://dl.dropbox.com/u/108997228/A2109A_ICSBootloader.zip

    Two other files are posted in other threads.
     
  3. arbarnhart

    arbarnhart Senior Member

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    Because something people have this but most don't, I think it is because of an app you installed. I would try shutting down a few running apps and see if the battery lasts longer. Maybe you can narrow it down to a particular app. If you aren't running the latest version, support is likely to ask you to upgrade if you have any issues.
     
  4. Ravak

    Ravak Member

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    Yeah, I had some battery-related issues the first time I updated to JB (or at least I thought I had). After a full-wipe and reinstall (and waiting few days to make sure it's settled down) I must say I have no problems any more. In fact, the more I use it the longer the battery seems to last ;)
     
  5. mcl630

    mcl630 Senior Member

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    I only have battery-drain issues if I leave the tablet sitting with Wifi off... if I leave Wifi on battery drain is normal.
     
  6. mcl630

    mcl630 Senior Member

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    That should work.
     

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