Ipsw.me , click your device download the firmware and in iTunes hold alt-option when hitting restore button and point to the filehow ? to get back 12.4.1
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TrueLaLey Sister, so TRUE and agree with you. But overall, after comparing friend sister's iPhone 6S on iOS 9 vs mine on current iOS 13 it's noticeably slower .the BATTERY LIFE tho, because no matter how many times you change the battery you cannot escape the old A9 Processor from 2015 that isn't POWER Efficient as the newer ones.What do you mean as slow as a 6s? My 6s runs super great under ios 13, it even feels snappier than before updating. Let iOS to finish the background processes, if its full, empty some space to allow it to swap better the contents of the RAM to the internal memory when needed and if its still slow back up with iTunes, do a factory reset and restore from the said backup. That will certainly fix it.
Well, its weird that sometimes my old iPad Mini 4 is faster on iPad OS than on iPhone 6S on iOS 13. I began to think that iPad OS isn't as heavy as iOS 13.My XS Max is OK. But I miss the fluidity and snappiness of iOS 12. Whenever Apple adds new things, the stability and responsiveness suffer.