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I need to temporarily jailbreak my iPhone 4 to fix Apple's iOS 6 bug making it impossible to access Japanese-to-English dictionary.

All I need and want to do is delete Japanese-to-Japanese dictionary.

Is it possible to tethered jailbreak iPhone 4 temporarily, delete the relevant folder, and merrily continue using the device in a non-jailbroken fashion?

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Also, I suppose a related question could be: does iTunes backup/restore the whole /User/Library/ folder. If so, then you could backup/restore after you jailbreak and be fine. – grgarside May 28 '13 at 13:43
@grgarside No reason for tethered jailbreak per se. I am currently uninterested in jailbreaking the current phone. It does everything I need, except for the dictionary. I'm happy with jailbreaking the tablet, but have no need to do so on the phone. – Ivan Vučica May 28 '13 at 17:12
Why is it so important together rid of that dictionary? – Tom Gewecke May 28 '13 at 19:24
@TomGewecke If you google around, the Japanese-to-Japanese dictionary blocks Japanese-to-English dictionary from ever appearing. On iOS 6 only. The only documented solution on iOS 6 is to get rid of the Japanese-to-Japanese dictionary. For a beginner studying a language, a monolingual dictionary is useless; on iOS 5, the bilingual dictionary was practical, detailed and very easy to use. – Ivan Vučica May 28 '13 at 19:26
Aha, I had forgotten that. In case it doesn't work out, some app options are at… – Tom Gewecke May 28 '13 at 19:39

Unjailbreaking a device without restoring it is currently impossible.

If you don't mind using a jailbroken device until it's fixed, you could jailbreak normally, then when Apple releases the fix, just backup with iTunes, restore to the latest iOS, and then restore the backup.

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One of the large issues I have with this is the inability to go to-and-from jailbreak as I please. If I jailbroke now, use it jailbroken, then want to undo it -- I can't, because I'll be forcibly restored to 6.1.3, and unable to jailbreak again. I do have 6.1.2 SHSH, but nonetheless. Plus, keeping the phone jailbroken and then simply loading it with a bunch of cr*p like I did on the iPad and previous phones is too tempting. ;-) – Ivan Vučica May 28 '13 at 17:14

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