ios 18.3.2 update issue on iphone 14 pro mobile

From last two weeks, I am trying to update my ios to 18.3.2. i have tried no of ways to update it and not able to update it. can anyone having issues with this.

I do have enough 30 gb free space on my iphone

I have unlocked the phone while updating it

i have tried on connecting to windows laptop and with itunes, after backing up the iphoe, then later while updating it said "iphone could not be updated error 4000"

on iphone connecting to charger and i did overnight the screen stucks always on "verifying update" i have tried this 4 nights. still same issue.

and also i have tried different itunes software suggested in some other groups.

Can anyone please check on this issue and suggest the solutions.