First of all ,take back up and then go ahead.
First Downgrade to is 10.3.3 using below link and then try to downgrade to 10.3.2 .otherwise you will see bootloop.
http://appldnld.apple.com/ios10.3.3se...
one clicl downgrade : https://www.any-data-recovery.com/pro...
Download ios: https://ipsw.me
Please TURN FIND MY IPHONE OFF before downgrade process and keep battery % to 50% or more:
-Go to icloud.com and login
-open find my iphone
-select your device and remove from account
-restart pc/mac and iphone
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