I use IPhone 3G, Jailbroke and Unlocked already. Some days before i upgraded the firmware to IOS 4.2.1 and I don't think it supports well. These are the Problems i have,
* Camera Icon missing - can't find and use em..
* Can't able to install apps or games from **no piracy** - always error.
* It went slow.
What should i do now. Should i downgrade? Please tell me the procedure too, if u r suggesting something...
We don't condone piracy, so please avoid discussing that.
You should downgrade to 3.1.3 if your phone is running slow on 4.2.1. You may do so by downloading a stock 3.1.3 ipsw, shift+restore to it, use TinyUmbrella to exit recovery when receiving error 1015, then jailbreaking with redsn0w 0.9.4 and a copy of a 3.1.2 ipsw.