Apple will sometimes recommend a DFU mode restore as part of the troubleshooting process. It doesn't matter if they could tell.I don't know to be honest, I read on internet and some people said that it can void my warranty so I was suspect about it.
Can an Apple employee know if the phone was restored with dfu mode or not?
Where do you even read it from? Strangely, you even mention jailbreak since it’s linked to DFU. DFU mode is used to update or downgrade firmware or restore from jailbreak. Jailbreaking voids warranty because it’s modify iOS via exploits to runs unauthorized tweaks and themes from Cydia (alternative to App Store)
I read on the internet about DFU and Jailbreak but never tried and I will never try because I don't want to loose my warranty
DFU mode (Device Firmware Upgrade) is an official feature built in by Apple. It definitely does NOT void the warranty.I read on the internet about DFU and Jailbreak but never tried and I will never try because I don't want to loose my warranty
DFU all you want.So in conclusion it is ok to do it?
I want to mention that I have a SIM-locked iPhone so this won't affect anything right?
Yes perfectly fine to do.So in conclusion it is ok to do it?
I want to mention that I have a SIM-locked iPhone so this won't affect anything right?
It does break EULA. If any part of the device fails, Apple will blame it on the current jailbreak and will not repair it, until returned to original ( or current ) iOS.Jailbreak doesn’t void your warranty.