SLUUCH2 March 2021 BQ40Z50-R2
This command sends the device into ROM mode in preparation for firmware reprogramming. To enter ROM mode, the device must be in FULL ACCESS mode. To return from ROM mode to FW mode, issue the SMBus command 0x08.
Command 0x0033 also puts the device in ROM mode (for backwards compatibility with the bq30zxy device).