Iphone 3g with 4.2.1 fw is slow. downgrade possible?

Hi my phone is jailbroken on 4.2.1 but is very slow.
My wifi isn't working and also my cell reception is allmost nothing.
Would a downgrade work for me?
My baseband version is 05.15.04

Discussion of jailbroken/hacked iphones is not permitted here.
There is no legit way to downgrade.

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Thanks for the question. Based on what you stated, it seems like the iPhone wont connect to the iTunes Store. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
Can't connect to the iTunes Store
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marcfromzurich wrote:
no, it just doesn't finish the sync!
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I have been happily using my iPhone synced with my Macbook over usb via iTunes.
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Can't I just set up Exchange as one of my calendars in ical?
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Iphone 3g with 4.2.1 fw is slow. downgrade possible?

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