You can use saa (SuperServer Automation Assistant).  This would require all the BMC user/PW to be the same.

SList.txt is a file containing all the BMC IP addresses.

<span style='font-family: "Calibri",sans-serif; font-size: 11pt;'>./saa
-l SList.txt -u ADMIN -P ADMIN -c UpdateGPU --item HGX_H100 --file fw_file<span style='font-family: "Calibri",sans-serif; font-size: 11pt;'>

<span style='font-family: "Calibri",sans-serif; font-size: 11pt;'>Re-timers
would need to be done separately and re-timer FW is mixed. 

<span style='font-family: "Calibri",sans-serif; font-size: 11pt;'>

<span style='font-family: "Calibri",sans-serif; font-size: 11pt;'>SXM
1, 2, 3, 4, 5 and 7 Retimer

<span style='font-family: "Calibri",sans-serif; font-size: 11pt;'><span style='font-family: "Calibri",sans-serif; font-size: 11pt;'><span style='font-family: "Calibri",sans-serif; font-size: 11pt;'>./saa
-l all_ip_admin_pass -u ADMIN -P ADMIN -c UpdateGPU --item H100_retimer --file
fw_file –dev_id 0,1,2,3,4,6,7

<span style='font-family: "Calibri",sans-serif; font-size: 11pt;'><span style='font-family: "Calibri",sans-serif; font-size: 11pt;'><span style='font-family: "Calibri",sans-serif; font-size: 11pt;'>SXM6
Retimer

<span style='font-family: "Calibri",sans-serif; font-size: 11pt;'><span style='font-family: "Calibri",sans-serif; font-size: 11pt;'><span style='font-family: "Calibri",sans-serif; font-size: 11pt;'><span style='font-family: "Calibri",sans-serif; font-size: 11pt;'><span style='font-family: "Calibri",sans-serif; font-size: 11pt;'><span style='font-family: "Calibri",sans-serif; font-size: 11pt;'><span style='font-family: "Calibri",sans-serif; font-size: 11pt;'>./saa
-l all_ip_admin_pass -u ADMIN -P ADMIN -c UpdateGPU --item H100_retimer --file
fw_file –dev_id