Removing Hatihati.A Malware by Soft Formatting
A soft format procedure cleans the phone memory only and SMS, contacts and others could still be intact. A phone lock code may be required. The default phone lock code for Nokia is 12345.
Note: Battery should be full up to 75 %.
Step 1: Remove the memory card (MMC).
Step 2: Turn on phone and dial *#7370# for soft format.
Step 3: Clean the memory card. You will need a PC connection and USB card reader/ writer.
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Insert MMC in the USB Card Reader/ Writer.

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Go to systems folder, then go to apps folder.

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Look for the Hatihati.A folder named “Guardian” and delete it.

Disclaimer: The procedures detailed in this document were compiled without consideration of any long-term side effects relative to their implementation.