E52 phone auto lock

My E52 has proble. After enanled function phone auto lock period 30 mins, I could not disable it. When i goto phone autolock period, change, select NONE, then it appeared error: phone unable to unlock.
I tried factory reset and reinstall software but still can not change. I have to enter lock code after every 30 mins phone unuse.
Anyone can help to fix it?
Thanks.
Solved!
Go to Solution.

I found this solution on Blog Hanzz, and it is working
Menu - cntrl. panel - settings - general - security - phone and SIM card - phone autolock period
The error was: Unable to change period
To remove it, I did the following:
Go to: Cntrl. panel - Phone - Encryption - Phone memory and switch setting to ON
Reboot Phone (do not know if this is necessary), go back to Phone memory and switch it to OFF
Now you can change the autolock period to None:-)

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E52 phone auto lock

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