Here's a complete step by step tutorial on how to downgrade iOS 13.6.1 to iOS 13.6 running on iPhone or iPad.

Apple is Currently Signing iOS 13.6, Downgrade from iOS 13.6.1 Now Before it's too Late

If, for some reason, you want to downgrade to iOS 13.6, you may do so right now as long as Apple is signing the firmware. Backup your files and data using the following methods first before going ahead: iTunes, iCloud or Finder.

Tutorial

Step 1. Download the iOS 13.6 firmware file that is meant for your device from the list below and save it on your desktop for easy access later:

iPhone 11 Pro Max, iPhone 11 Pro, iPhone XS Max, iPhone XSiPhone 11, iPhone XRiPhone XiPhone 8, iPhone 7iPhone 8 Plus, iPhone 7 Plus2020 iPhone SE 2iPhone SEiPhone 6siPhone 6s PlusiPod touch seventh-generation12.9-inch iPad Pro (fourth-generation)11-inch iPad Pro (second-generation)11-inch iPad Pro, 12.9-inch iPad Pro (third-generation)10.5-inch iPad Pro, 12.9-inch iPad Pro (second-generation)iPad 5, iPad 6iPad mini 5, iPad Air 310.2-inch iPad 7iPad mini 4, iPad Air 29.7-inch iPad Pro (first-generation)12.9-inch iPad Pro (first-generation)

Step 2. Connect your iPhone or iPad to your computer using a Lightning cable.

Step 3. Launch iTunes or Finder.

Step 4. Click on your device's icon as soon as it shows up in Finder or iTunes.

Step 4. Now click on the Restore iPhone button while holding down the left Shift key (Windows) or the left Option key (Mac).

Step 5. Select the iOS 13.6 IPSW firmware file you downloaded in step 1.

Step 6. Finder / iTunes will now start extracting the contents of the firmware and then ultimately restore your iPhone and iPad.

Step 7. Once the restoration is complete, you can set up your device as a brand new one or restore from a backup which you took prior to this tutorial.

Given that iOS 13.6.1 is nothing more than a bug fix release, it's best to stick around with it. But we all have our reasons to be on a particular firmware and not the other so it is entirely your call at the end of the day how you choose to use your device.

Read more:

Download: iOS 13.6.1 and iPadOS 13.6.1 Released for iPhone, iPadClean Install iOS 13 Final or iPadOS on iPhone, iPad Right Now [Tutorial]