cocoapods could not find compatible versions for pod "firebase_core": flutter code example

Example 1: cocoapods could not find compatible versions for pod cloud_firestore

# platform :ios, '9.0'
change to 

platform :ios, '10.0'

Example 2: CocoaPods could not find compatible versions for pod "razorpay_flutter" when running pod install

CocoaPods could not find compatible versions for pod "razorpay_flutter" when running pod install

This is due to your minimum deployment target being less than iOS 10.0. To change this, open ios/Podfile in your project and add/uncomment this line at the top:

# platform :ios, '9.0'
change to 

platform :ios, '10.0'