Error when checking for software update for xperia z3v

[Fleet07]

Im currently on android version 4.4.4 and I want to check for an update. When I click System Updates -> Check for new software update, I get this error: "Error during DM session". I'm still getting this error after doing a factory reset. 

Any Ideas?

Also, Im running my phone on WIFI only as I do not have a SIM card yet.

Thank You,
Collin

[Zubair12]

sony xperia Z3v can cany one please help me i cant Update my device .... as always show 'error during dm session'.. please help what i have to do...

[Uliwooly]

@Zubair12

could you elaborate?