For future updating you need not add or delete the launcher.png as long as it remains properly processed by Kobo and in Kobo's database and the database is uncorrupted, just leave the launcher.png as it is. If the database gets corrupted and/or you have to do a factory reset, you may have to delete the existing launcher.png file in your kobo device's Library to be sure it is removed from the database and reinstall it, so that you can be sure that it is processed properly, as you rebuild from whatever caused the corruption or need to factory reset.
Luck;
Ken
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