can i do it without connection to internet
???????
If you have already downloaded the firmware and eMMC image then no.
To download them initially, yes, of course you do.
Also:
1. try using a descriptive thread title, you will attract more responses.
2. next time try using google, power search etc. Try to show others you have at leas tried to help yourself. This will also attract more responses, it will also show other your are willing to learn and not just feed off others.