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Programming bq27500

Hello,

I have two questions:

1. What is the default access mode right after the device was powered up?

2. Right after the device is powered up, I send the command to put the device in UNSEALED MODE and then in FULL ACCESS MODE.  These are to send Unseal Key 0 and 1 and Full-Access Key 0 and 1 shown on page 19 of SLUS816A.  The issue is that when I send Unsel Key 0, the device returns -7.  Accordig to I2cSDK.h, -7 means no ack returned by the device.  I am sure that the device is powered up.  What can be its cause?

Thank you for your help.

Jun Inagaki