[error 14] while trying to restore without losing the data

[mribraqdbra]

Hello,

am trying to bypass the icloud using the sliver dump method by appletech752...!

The problem Is checkra1n doesn't support my iDevice because of IOS version so I need first to update It...!

but while am trying to update my iDevice to the latest version/13.7 am getting the error 14

ERROR: Unable to restore iDevice(-14)

my device Is iPhone 6s
IOS version really I don't remember It but maybe It's IOS 11.x

What did I tried?
- Restoring in DFU Mode...!
- Changing the USB/PC

Thanks.