[NokiLumia520]

Yesterday i tried to update my lumia 520 to lumia denim it was stucked at spining gears so i recovered it with windows phone recovery tool, and today i fully charged phone and tryed toupdated it and it's stucked on spining gears again. I'll recovery it with windows phone recovery tool, but should i try to update it again? And what is the problem?

[henocksandy]

It takes around 20-30min for my L520 to update.. Try again and check if you have enough storage

[alex athanasopoulos]

The updates can last up to an hour have patience and avoid stopping an update on the process of installation, otherwise you could brick your phone.

[Ymanish]

Give 30 mins to gears and then do soft reset. No need for recovery tool

[Harrie-S]

If you used the Lumia software recovery tool you should get Denim.
So did you use the windows or Lumia recovery tool?

Sometimes a sd card also causes this so you could try the update after you remove the SD card.

[NokiLumia520]

recovery tool updates to cyan instead to denim but i'll try without sd card thx