I am experimenting with a laptop battery that uses the bq2060a. I have been able to read and write all commands, including the ManufacturersAccess 0x00, 0x0606 to connect the SMB bus to the EEPROM and then read and write to it OK.
But now something's happened - I can still read/write the bq6060a commands, but it no longer responds to the ManufacturersAccess so I can't read the EEPROM. The Seal bit is not set. I want to try resetting the bq2060a, but I do not understand page 18 of the datasheet, where it says to that to do Device Reset, write 0xff5a to address 0x4f, 0x0000 to address 0x7d, and 0x0080 to address 0x7d. Nowhere in the datasheet does it say how to write to an address. It describes these codes as a command sequence, so does it mean "Command" not "Address" for the 0x4f and 0x7d? If so, the chip doesn't acknowledge them.
Perhaps the only way is to open up the battery and disconnect the supply to the chip momentarily to do a power-on reset.