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[blog.syncios.com]
Based on the model number of your iPhone, you will be able to identify which iOS firmware file you need to download.

You can find model number on the iPhone’s back cover.

https://blog.syncios.com/wp-content/uploads/2018/12/iphone-cdma-or-gsm-number.jpg

[blog.syncios.com]

Refer to the table below to find out the identifier for your iPhone so you can figure out which iOS firmware file to download.

For example: You need to download iPhone5,1_6.1.3_10B329_Restore.ipsw file for your GSM iPhone 5 with model number A1428.

https://blog.syncios.com/wp-content/uploads/2018/12/ios-firmware.jpg

[blog.syncios.com]

Based on the identifier for your iPhone model, you can download the appropriate iOS firmware file or iOS software update for your iPhone from our download page.

You may also want to know:

How to Make iPhone XS/XS Max Ringtones without iTunes [syncios.com]
7 Ways to Restore iTunes / iCloud Backup to iPhone XS/iPhone XS Max/iPhone XR [syncios.com]
5 Ways to Import Music to iPhone XS [syncios.com]

Source [iphonehacks.com]