Problems restoring from 4.1 to 4.2.1 on iPhone 4

[Lionkid7]

Hello people,

I had my iPhone 4 on 4.1, jailbreaked (not unlocked). I deleted in "/System/Library/" the "Cache" folder (don't ask why). After rebooting, the iTunes Logo with the USB Cable came up (Recovery Mode).

So, I downloaded Firmware 4.1 and 4.2.1 from Apple. When I try to restore to any of those two, I am getting errors. First, I had the 3194 error. After editing the etc/hosts/ file on Windows, I managed to bypass that, however, later, when the restore is being verified, following errors come up: 1004 and 1014 or something.

Please, can anyone help me get my iPhone back?

[seann33uk]

i think its something to do with itunes and jailbreaks,
Try kicking out of recovery using tinyumbrella or by running greepois0n or which ever you're using to JB

[Lionkid7]

The 4.3 Restore worked. Sucks actually. TinyUmbrella might have helped...

It seems like Apple blocked upgrading to firmware which are not the latest release...