https://community.sony.com.mk/t5/xperia-archive/software-failure/m-p/3313460#M441598 <P>Try performing a system repair as this will often fix issues after an upgrade - This will factory reset your phone<BR /><BR />Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)<BR />Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the onscreen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process<BR /><BR />If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP</P> Sat, 25 Oct 2014 16:28:38 GMT Thommo 2014-10-25T16:28:38Z https://community.sony.com.mk/t5/xperia-archive/software-failure/m-p/3313459#M441597 <P>tried updating software and now, half way through it has crashed and says 'ENGINE FAILURE - ERROR 100'</P><P>my phone wont even switch back on now, ive tried the re-boot (holding down the volume up and power button) but nothing works??</P><P>can anyone help please?</P> Sat, 25 Oct 2014 16:27:24 GMT https://community.sony.com.mk/t5/xperia-archive/software-failure/m-p/3313459#M441597 gmcb 2014-10-25T16:27:24Z https://community.sony.com.mk/t5/xperia-archive/software-failure/m-p/3313460#M441598 <P>Try performing a system repair as this will often fix issues after an upgrade - This will factory reset your phone<BR /><BR />Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)<BR />Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the onscreen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process<BR /><BR />If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP</P> Sat, 25 Oct 2014 16:28:38 GMT https://community.sony.com.mk/t5/xperia-archive/software-failure/m-p/3313460#M441598 Thommo 2014-10-25T16:28:38Z