Create bootable USB/ISO for updating T7500 firmware?

I am running linux on the workstation and I want to update its BIOS, and PERC 6/i adapter. How do I create a bootable ISO to contain these firmware and install them?

The reason I want to upgrade firmware: The PERC adapter somehow can't see one of the 8 hard drives. Looking at the information of the adapter with MegaCli64 command line, I got the following, where address for the last port is empty:

                    Versions
                ================
Product Name    : PERC 6/i Adapter
Serial No       : 1122334451167748
FW Package Build: 6.2.0-0013

                    Mfg. Data
                ================
Mfg. Date       : 06/24/08
Rework Date     : 06/24/08
Revision No     :
Battery FRU     : N/A

                Image Versions in Flash:
                ================
FW Version         : 1.22.02-0612
BIOS Version       : 2.04.00
WebBIOS Version    : 1.1-46-e_15-Rel
Ctrl-R Version     : 1.02-015B
Preboot CLI Version: 01.00-023:#%00006
Boot Block Version : 1.00.00.01-0011

                Pending Images in Flash
                ================
None

                PCI Info
                ================
Controller Id    : 0000
Vendor Id       : 1000
Device Id       : 0060
SubVendorId     : 1028
SubDeviceId     : 1f0b

Host Interface  : PCIE

Link Speed          : 0
Number of Frontend Port: 0
Device Interface  : PCIE

Number of Backend Port: 8
Port  :  Address
0        1221000000000000
1        1221000001000000
2        1221000002000000
3        1221000003000000
4        1221000004000000
5        1221000005000000
6        1221000006000000
7        0000000000000000