If the testing can not be start, and the software shows no abnormal, please check the start mode setting.

① The second generation of A8 screen calibration.

Operation steps:

When the screen mouse drift occurs,

press LOCK 10 times continuously to enter the screen correction interface,

click the crosshair icon successively according to the instructions,

click End, return to the test interface, wait for 30 seconds, and then shut down; Wait one minute for the restart to take effect.

②[Board card replacement method]

Operation steps:

Step 1: Loosen the screws fixing the upper and lower board cards with a screwdriver.

Step 2: Use both hands to pull the board out horizontally (pay attention to the upper and lower guide slots).

Step 3: Insert the new board horizontally along the guide slot.

Step 4: Tighten the upper and lower fixing screws.