Very slow file transfer (USB 3.1 looks like USB 2.0)!

MelquiMelqui Level 3
edited September 2020 in ROG Phone 2

I have very slow file tranfer with:

  • ROG Phone II Global 512GB-12GB with latest ROM
  • A Original USB-C to USB-C cable
  • A USB-C to USB 3.0A cable
  • Notebook with a USB 3.0 type-c port and usb 3.0 type-a port

Looks like the phone doesn't activate USB 3.0 speed tranfer, only 2.0 speeds!!!

(Phone without other problems, hyper charging normally, etc)

Please solve this!


  • MelquiMelqui Level 3
    edited May 2020


    • USB-C to USB 3.0A cable and notebook tested with a Galaxy S9+: Turbo speeds, ubs 3.0 activated!
    • Using ROG II side port to test too!

    • USB-C specs notebook Acer F5-573G:

    USB 3.1 Generation 1 with data transfer speeds up to 5 Gbps

    Charging external devices via USB-C (5 V ; 3 A)

    ROG Phone II only supports USB 3.1 and USB 2.0? Doesn't supports USB 3.0?

  • The stock USB-C to USB-C cable is 2.0, so no surprises there.

    You should be achieving 3.0 speeds by using your 3.0A cable and the side port on the ROG II. Have you tried using a third USB-C cable to make sure that the cable is not at fault? You can also try switching the orientation of your cable and/or making sure that your side port is clean.

  • MelquiMelqui Level 3
    edited May 2020

    I tested ROG II with a USB-C - USB-A 3.0 cable. This cable works at 3.0 speeds with Galaxy S9+, with ROGII (side port), only 2.0 speeds.

  • OPCOPC Level 4

    MacBook Pro 2015, using USB-C to USB-A Samsung cable bundled with Note 8 makes 3.0 transfer speeds. Also with DJI OSMO 3 cable (also USB-C to USB-A).

    With both cables 499 MB mp4 file was transferred in 18 sec.

    With Samsung cable since the A10 upgrade it's important to plug the cable into the Rog 2 side port with the correct side of the jack facing up.

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