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BQ24195: Can't wake up

Part Number: BQ24195

Hi

we can't power charger up from shipping mode. 

First, we discharge battery to 2.9 V and send ship command to charger by (REG05[5:4] = 00) and disable BATFET (REG07[5] = 1)

Then we plug a stable 12v DC source to Vbus but REGN LDO is still 0V sometimes. 

But from datasheet, it mentioned when the DC source plugs in, the bq24195 checks the input source voltage to turn on REGN LDO. 

Another, we remove DC out, we found the Reg09[5:4] is 01 , it indicates Input fault (VBUS OVP or VBAT < VBUS < 3.8 V). we are not sure if it affects power up sequence. 

Could you please give us ideas?