QUOTE(realitec @ Dec 22 2017, 11:23 AM)
Do I need to do back up so that i can downgrade? Is it hard? Any link that I can follow?

If yes, then no risk to go for iOS 11.2 already for me ;P
QUOTE(rowlet @ Dec 22 2017, 11:32 AM)
backup cannot be restored on earlier version.
QUOTE(realitec @ Dec 22 2017, 12:13 PM)
Thanks for reply. Waiting him to reply, maybe there is other way to restore to older version ops.
as long as u backup 11.1.1, then upgrade to 11.2 and perform another backup ( now u have 2 backups = 1 for 11.2 and another older for 11.1.1), once u downgrade ios, u can backup the older one.... hmmm its very easy to downgrade firmware, but first u need to make sure the firmware u wanna downgrade is still signed by ipsw (https://ipsw.me/ = check availability). if its not signed means cannot downgrade..
EDIT: just checked 11.1 is not signed anymore... so yea u cant downgrade it..
This post has been edited by dikae: Dec 22 2017, 01:19 PM