BQ27Z855EVM: ACOV Release Fail issue

1. AFE Over Voltage is setting 0x5b,change to DEC is 4550mV, 4570mV should trigger ACOV. Exactly, even I set Cell Voltage to 4900, it also shows COV=1, ACOV = 0. And when recovery, I set back cell voltage to 3800 and wait more than 1 minute also can't see pack voltage release.

My EVM Version is 1855_0_05, is that related to the version