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Re: updated my Galaxy S4 today, and now it's completely unstable. crashes all the time.

Líder Sénior

Well sometimes with updates you can get by with no issue or there can be issues and when there is you need to try and iron it out by way of  1.  clearing the system cache which can help stable up the phone or you may have to Factory Reset.. which you will have to back up your contacts, back up n save your pictures or your music then pull then proceed with the Reset.. but first try running the system cache clear..

See if that helps the phone..