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The “yyKSv57PGexzJcE2hqu7Ku3PdEeKsqhgKCU70ttm” ID do not end with ‘t1’, which means that .topi files are encrypted with an online key. Such files cannot be decrypted, since only criminals, the creators of the Topi virus, have the decryption key. In this case, there is a chance to restore the contents of the encrypted files using the following guide: How to recover ransomware encrypted files.