Settings option not opening after window 10 update in lumia 820

[Gorav Kukkar]

I am unable to open settings menu after updating window 10 in lumia 820.also unable to see pics,phonebook etc..help me guys..

 

[Harrie-S]

Did you already try a hard reset.

 

[Gorav Kukkar]

Yes..i tried it many times with low volume key and power push but not working after that too..tried to downgrade by lumia recovery and window recovery tool but not being downgraded..failed

 

[Harrie-S]

Yes..i tried it many times with low volume key and power push but not working after that too..tried to downgrade by lumia recovery and window recovery tool but not being downgraded..failed

Low volume key +power is a soft reset.
See below how to do a hard reset.
Reset my Windows Phone 8.1 | Windows Phone How-to (United States)