Fix error 805A8011 on Windows Store for Windows Phone

This video contains info on how to fix error 805A8011 while using Windows Store for Windows Phone.

To sum the solutions up, please check:
Manually synchronize your Microsoft account: Settings -> email+accounts -> tap and hold on Microsoft account -> syncronize.
Check if date and time setting are correct and change them for manual. Using the Auto option is recommended.
Change Internet connection from WiFi to 3G and vice versa.
If nothing helps, you might need to do a soft (first) > hard Reset.
1. Manually synchronize Microsoft account
Settings -> email+accounts
Note: you may need to create your own MS ID first: to do so, visit mail.live.com/

tap and hold on Microsoft account

To synchronize your Microsoft account, plz see www.spark.co.nz/help/mobile-data/device/os/windowsmobile/sync-contacts-emails-and-calendar-with-your-microsoft-account-windows-phone-8/ for more info.
2. Check date and time setting: Settings > Date + Time

Edit the date and/or time option that work for you.

3. change Internet connection from WiFi to 3G and vice versa.
Settings > Cellular

Turn the Data Connection On & enable 3G Connection

4. Hard Reset your phone.
1) Back up your personal data (photos) first:
Settings > Backup > Photo (Back up to Skydrive)

For more info, plz read nokiapoweruser.com/windows-phone-backup-all-that-you-need-to-know-resolving-backup-erros/ and/or www.windowscentral.com/do-master-reset-windows-10-mobile-insider
2) reset your device
For Nokia Lumia 520 Windows Phone 7:

For Nokia Lumia 520 Windows Phone 8, try:
press the following keys in the exact order:
1. Volume up
2. Volume down
3. Power
4. Volume down
Or, (for Windows Phone 8.1, ) use menu this way: Settings > About > launch Rest your phone > follow...

Windows 10 Mobile:

Other options:
1. free up phone space:
App > Storage Sense (check)

Uninstall unused apps and/or games: Apps > locate the app you want to remove / you do not use.

Start > Apps > Games:

Move media files

Clean Up Temporary Files: App > Storage Sense > temporary files

Delete Downloaded Maps & Map Searches

For more info, plz read www.digitalcitizen.life/how-free-storage-space-your-windows-phone
2. Update your WP and use the Windows Store as a logged-in MS user.
Settings > Phone update

3. Soft reset:
Nokia Lumia 800 & Lumia 900:

Lumia 800: press and hold the volume keys and power button together for 3-5 seconds
Or: settings > region > Change the country > reboot > follow...

4. move your personal data to a SD card: configure music + videos & pictures storage location