Is it safe to upgrade my jailbroken iPhone 3GS (IOS 4.1) to IOS 6.1.6?

Is it safe to upgrade my jailbroken iPhone 3GS (IOS 4.1) to IOS 6.1.6? Will it make my phone slow? Will it harm/damage my phone?

Added (1). I need really good answers so I'm confident that it's either safe or not safe.

No its not safe because that phone old af.

Yes you can update. However, you will lose your jailbreak. It is up to you, if you want more features / security I would suggest updating. Have a great day.

Yes, you can update safely via restore in iTunes. But I wouldn't suggest since you may have a lag when operating the device.

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