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  1. Vitor Ferreira's Avatar
    I cant update to build 10536 on my wp because I keep receiving this error 0x800705b4. Does anyone knows something about it?

    I'm new on Windows 10 mobile technical preview. Is there any easy way to go back to 8.1 to try it again from the beginning?

    Thank you!!!
    amir darami1 likes this.
    09-15-2015 10:59 AM
  2. sparsha's Avatar
    Facing the same problem in L620. So far, haven't received a fix.
    09-15-2015 11:02 AM
  3. RumoredNow's Avatar
    This thread has been moved to an appropriate forum...

    As per this advice: WC members are free to post in all areas of the board. Please use Ask a Question only for time critical help issues that affect the immediate functionality of your device.
    09-15-2015 11:24 AM
  4. slipslip's Avatar
    Getting the same error on my Lumia 521.

    Easiest way is probably to install the Windows Phone Recovery Tool.

    ***BACKUP FIRST (if you didn't back up just before you first attempted to install new build)
    You can also go to Settings, System, About, and use the Reset Phone function. That will bring you back to factory settings-- but it wipes out all of your apps, settings, etc. so you'll want to back up beforehand and then use the Restore option during the set up process.

    Gotta say, though, I'm getting pretty frustrated with the insider preview for W10M. I know they aren't finished yet, and they warn upfront that you shouldn't install it on your main/ daily driver phone, but it just seems like they should be further along at this point. I keep thinking "Oh, this next build will be the one where they get it together", but the time interval between builds and the errors like this one are turning me off.
    jmprice likes this.
    09-15-2015 11:30 AM
  5. Sooriya Prakash's Avatar
    Same Problem on my lumia720 too. I have downloaded it 4 times, but the installation process is stuck at 6% and then failed.
    09-16-2015 04:23 AM
  6. LongTrail's Avatar
    Me to Lumia 635, have often had to go back to 8.1 before upgrading... Grr!
    09-16-2015 09:40 AM
  7. Ian Middleton's Avatar
    Add a me too for Lumia 820 on 10512 goes through all the download OK, then fails at installing with the above error.
    - Tried numerous times.
    - Tried updating all apps first.
    - Uninstalling Windows Insider, re-installing Windows insider, re-applying to fast track.
    - Got 1.5GB free space on phone.
    - Disabling developer mode (to run Android apps)...still fails.
    Last edited by Ian Middleton; 09-17-2015 at 09:29 AM. Reason: Update.
    09-16-2015 10:37 AM
  8. wlupus's Avatar
    have the same trouble on lumia 525. Seems it's necessary to roll back to 8.1 or just wait for a proper build configuration
    09-17-2015 05:07 AM
  9. jmprice's Avatar
    I'm echoing slipslip here:

    I had 10512, and it was crap on my Lumia 920.

    I downloaded the Windows Recovery Tool, reverted back to 8.1, then re-updated to newest release from 8.1. Just finished 10 minutes ago, so no results to report yet. Looking forward to greater stability and my phone not freezing.
    09-19-2015 08:03 PM
  10. WiseManWhite's Avatar
    Same here. I've tried re-installing it multiple times, get to 6% installing and receive the error. I may just go back to 8.1
    10-17-2015 02:50 PM

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