9.11.2.4 is the latest and suggested firmware. [URL] Keep us posted and let us know if this helps. 
Hello,  Why there is no alarm when I remove one of the PEM on Z9100-on? There is PEM removed log, and automatically cleared as below. TORSWA02(conf)#Sep 23 00:14:37: %STKUNIT1-M:CP %CHMGR-5-PEM_REMOVED: Power entry module 2 of unit 1 is removedSep 23 00:14:38: %STKUNIT1-M:CP %CHMGR-5-PS_DOWN_CLR: Power supply 2 down reported in unit 1 is clearedSep 23 00:14:40: %STKUNIT1-M:CP %CHMGR-5-PSU_FAN_STATUS_DOWN_CLR: Major Alarm cleared : Fan 1 in PSU 2 of Unit 1 down alarm reported is cleared 
Z9100-on remove one PEM don't have alarm