Upgrade Mode Switch Failure; Manually Update Drivers - Acer Z320 Service Manual

Step 3: enter engineering instruction #### 8787 #### 7878 # # and turn off the phone Log.
Step 4: redisconnect the phone, power, re-open the tool, and then connect the phone.
The fifth step, if it cannot resolve. Please restart your computer and then connect your phone to open the tool
to try.

(2) Upgrade mode switch failure

Make ensure that before upgrading T card is not inserted, the investigation is as follows:
Step 1: Open the Device Manager to see whether the port to see if a drive is not installed.
Step 2: Check the battery, if the battery is low, the switch no device （the driver has not been WHQL certified，
need to manually update drivers）
Step 3 USB cable may be connected to the front USB port on the computer, hanging dead after switching
USB ports. Please plugged into the rear USB port.

(3) Manually update drivers

Automatically after the installation is complete driver, if the driver has not been certified WHQL, following
dialog box will pop up:
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