I9001 full phone wipe

I have few questions for wiping the phone?

A lot of time passed since I bought this phone, and there are a lot of garbage in sdcard and system itself? I changed many ROMs, and I want to breathe new life to phone.

I am interested in following CWM functions:
format /system
format /cache
format /data
format /sdcard
format /emmc

Will it erase everything and everything from the phone and sdcard, including the system?
Will this remove CWM and Root?
How to flash new system again, when I am not able to boot?

Is above procedure same as this, except that in this case, I am able to boot latest installed system?
- wipe data/factory reset
- wipe cache
- wipe dalvik
- format sdcard
- format emmc

What about code *2767*3855# , what is included under this type of wipe/reset?

Thanks

OmarPlus said:

This just wipes apps. When you format /system it won't boot so you can only install a new ROM or restore a backup.. A

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Click to collapse

How to restore backup when I formatted sdcard?

Is it safe to format emmc, and what is purpose of emmc?