9.1.14 Power on phone and input “*#84666*#”, select “one key Restore”, phone will be reboot, then the user’s
setting could be eliminated entirely.
Description: can’t power on(also upgrade software fail)
Root cause: red scroll 100% run completely when upgrade software, the detail as figure 1, also it prove power
supply, clock is normal and defective typical issue is focus on CPU or FLASH poor soldering or
damage, and maybe software do not fit for hardware.
Corrective action: check software fit for hardware whether or not, resolding CPU and FLASH or exchange new
CPU and FLASH.
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