Dell 5324 Cannot boot FATAL ERROR

My Dell switch 5324 cannot boot after load everything finish it error message FATAL ERROR and start reboot infinity loop, before this behavior I used Firmware v20039 with boot v10202 but I have a issue LACP I try to test by downgrade firmware back to v10047 with boot v10021 after reboot it show below error message.
- I try to upgrade firmware by xmodem back to v20039 but nothing it still load v10047. How can I set switch boot from new firmware new boot after upload by xmodem? or anything can help please...
********************************************************************* *** Running SW Ver. 1.0.0.47 Date 02-Nov-2005 Time 09:53:18 *** ********************************************************************* HW version is 00.00.02 Base Mac address is: 00:18:8b:9c:d2:86 Dram size is : 64M bytes Dram first block size is : 40960K bytes Dram first PTR is : 0x1800000 Flash size is: 16M Loading running configuration. Number of configuration items loaded: 962 Loading startup configuration. Number of configuration items loaded: 962 Device configuration: Prestera based system Slot 1 - powerConnect 5324 HW Rev. 0.0 Tapi Version: v1.2.10 Core Version: v1.2.10 01-Jan-2000 01:01:32 %INIT-I-InitCompleted: Initialization task is completed 01-Jan-2000 01:01:32 %Box-I-PS-STAT-CHNG: PS# 1 status changed - operational. 01-Jan-2000 01:01:32 %Entity-I-SEND-ENT-CONF-CHANGE-TRAP: entity configuration change trap. 01-Jan-2000 01:01:32 %Box-I-FAN-STAT-CHNG: FAN# 1 status changed - operational. 01-Jan-2000 01:01:32 %Box-I-FAN-STAT-CHNG: FAN# 2 status changed - operati01-Jan-2000 08:01:32 %OS-F-TIMER: OSTIMG_timer_start: Timer's magic is illegal ***** FATAL ERROR ***** Reporting Task: IOTM. Software Version: 1.0.0.47 (date 02-Nov-2005 time 09:53:18)