I can't update to 4.91 Hen

The update file for 4.91 downloaded from ps3xploit.me does not go. It says "No relevant data found" Despite the fact that I formatted the stick to Fat32 and did all the procedures (create a folder called PS3, then inside create a folder called UPDATE and inside the update folder drag the file). It won't even go into recovery mode.... Can you help me?
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I can't update to 4.91 Hen