TS3694 trying to restore my phone and error occurs with 1015 in the message anyone know what this is?

bought a second hand iphone that worked fine untill i tried to restore to factory settings and put a simcard in. now tring to restore the software, but everytime it comes up with an error message half way through with the code 1015 on the end. anyone knows what this means??

Error 1 or -1
This may indicate a hardware issue with your device. Follow Troubleshooting security software issues, and restore your device on a different known-good computer. If the errors persist on another computer, the device may need service.
Has the firmware been modified before you updated the iOS? If yes, this error could be a result of a jailbreak.

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