Need help upgrading 6.61 pro-C to Darkspeed (?)

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I have just gotten my very first PSP Go from eBay and it came with a 6.61 pro-C CFW and I have heard, that the best firmware (which does not break the PSP's break funtion) is darkspeed.
So I was wondering how I would go about upgrading the firmware. I hope, that one of you guys could help a bro out here :D
I am a complete newbie and would appreciate any kind of help. Thank you!

submitted by /u/chiefbriand
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