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Yes, but only if you have your SHSH blobs saved for 4.2.1. Apple will (or already has?) close the signing window for 4.2.1 very soon.

Can you restore and then upgrade to 4.3 if you don't care about jailbreaking again? Thanks for all the help. I'm just trying to understand how this all works. I do love my JB.
 
Can you restore and then upgrade to 4.3 if you don't care about jailbreaking again? Thanks for all the help. I'm just trying to understand how this all works. I do love my JB.

Yes but whether you care or not, there is already a 4.3 jailbreak (tethered) and there will be an untethered in the near future. I say go for it. :D
 
Delete Installous and stop pirating. That's the difference.

He/She probably has a repo that has cracked Cydia apps. Instalous has nothing to do with it as that only has Apple Apps. I'm sure it was an innocent mistake. When I first got into the JB community I googled a search for repos and did not know what to expect so I added a few from a list posted on a reputable website. Now Cydia specifically gives a warning if the repo you are attempting to add is one that sanctions piracy.

Anyway, that pkgbackup app is wonderful and a bargain at $7.99. I bought it when it was a little cheaper and I even donated a few bucks to the developer because this app saves you a great deal of time when you have to restore your phone after updating to a new version of IOS.
 
He/She probably has a repo that has cracked Cydia apps. Instalous has nothing to do with it as that only has Apple Apps. I'm sure it was an innocent mistake. When I first got into the JB community I googled a search for repos and did not know what to expect so I added a few from a list posted on a reputable website. Now Cydia specifically gives a warning if the repo you are attempting to add is one that sanctions piracy

True true. Spoke before I though it all through. My apologizes.

Just annoying when people come here who install shady software/repos and wonder why their iDevice has (insert complaint here).
 
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