Step 1: Look to your left side of the screen.
Step 2: notice the Guides button/icon ?
Step 3: Click it
Step 4: Read
Step 5: If at that point you have problems, please by all means ask for help.
If you can't be bothered to do one bit of research before asking questions that have been answered many times over, don't expect people to help.
But downgrading is safe. I think of of the devs or someone said that almost everything you do to your phone through software can be recovered. So the likelyhood of you bricking just by downgrading, jailbreaking and such arent very good. You should be fine.
Quote:
Unlocking:
This is the step required to make the baseband chip (the modem) work with any SIM card in your phone - not only Apple's chosen provider. This is in fact the most dangerous step of them all as it involves flashing your Baseband's firmware. Usually tools like anySIM do this for you.
Jailbreaking:
Jailbreaking is the step that is required before we can do anything to your phone. This involves removing the write protection from your phone's file system and installing basic tools such as the BSD Subsystem and SSH (remote shell).
Activating:
You know the "Activate iPhone" screen right after turning it on? Exactly. The step called "Activating" allows us to get past the "Please Activate iPhone" screen and use the iPhone interface.
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