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BQ27421-G1: BQ27421YZFR-G1A: Not able to wakeup from the shutdown mode

Part Number: BQ27421-G1
Hello,
We have successfully initialize the fuel gauge (BQ27421YZFR-G1A) and able to read the state of charge.
Now we have to put the fuel gauge into the shutdown mode and wake-up it, for that followed the below steps,
For gauge Shutdown:
 1. Unseal the gauge.
 2. Send the shutdown enable command (0x001b) 
 3. Send the shutdown command (0x001c) 
For gauge wakeup:
 1. Send the toggle gpout command (0x0023)
Gauge successful entered into the shutdown mode but it's not wake-up using the above mention steps.
Kindly provide the solution for same.
Thank you.