[WPCentral Question]

I became insider months ago, but I didn't attempt to download until build 10536 showed up. Now, after I downloaded it wasn't build 10536 but it was build 10136. Now update 10536 shows in the phone update but I cannot install it. I can download it but while preparing to install it gives error message 800705b4. Its lumia 820.

[pankaj981]

I would suggest rolling back to 8.1 and then perform the upgrade again. Make sure you remove your SIM card and microSD card before performing the downgrade and upgrade.

[keathkeath]

I have no means of rolling back to 8.1. Is there any workaround for this issue?

[Harris Aleem]

Yup same problem

[Teo Bartulovic]

I'm afraid that rolling back to 8.1 with the help of win phone recovery tool as suggested already is the only solution...

[keathkeath]

I saw one of Gabe's tweet and it mentions that the error is due to lack of phone resources. It might mean that for this to be solved, one must start rolling back using WMRT or installing the latest build with no other application (including background apps) running.

I hope they make the next build a one hop process regardless of the current running build on the phone.

[amir darami1]

Hi Windows Phone 1520 cannot update