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This did not work completely although I followed the procedure twice. Although I can now access the Playstore and it accepted an order and charged me for a Swift 3 Keyboard, that app has not installed and only appears at the top of the list of ´My Apps´.
The message saying that the Android keyboard has stopped still keeps appearing. In addition, another error message appeared saying that Únfortunately, com.google.process.gapps has stopped´ In addition, the Google account says that -Sync is experiencing problems. It will be back shortly.
Please try to do a another reset on your phone. Note: We are clearing out temp files on your device. Your internal photos, videos, and Ringtones will be ERASED. Please move/copy to SD card or to your computer before this reset.
How to Backup Contacts to SD card:
To backup your SMS text messages:
The keyboard suddenly came back on just as I was backing up the SMS. All seems well now and Playstore has updated my apps and, somewhat reluctantly, downloaded the Swift 3 Keyboard.