The "U1" in the filename refers to the (also known as Bit or Revision) of your device's firmware. Samsung devices use a security fuse system where you cannot downgrade to a lower binary level. A U1 patch file is specifically designed for the earliest security version of the G610F. The Auto Patch file is used primarily to:
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Download and install the official Samsung USB drivers on your Windows PC so the flashing tool can recognize your phone. The "U1" in the filename refers to the