Honestly, it isn't worth the hassle on an iPad 1. Even if you finally get iOS7 on it, it will be so slow as to be effectively unusable.
It's time to get a new iPad ,since yours is now 4 or more years old.
I have an iPad 1 and it is now relegated to performing musical functions. It's connected to the home stereo [permanently] and is used to play music from iTunes, Pandora and TuneIn Radio.
By the way, Jailbreaking an iOS device is not for the faint of heart...it brings with a whole host of new issues...
Good Luck!
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