@Fernando
Some troubles with my English and both your messages and @MeatWar
This is not a mainboard BIOS module. It is a TPM module that plugs into a motherboard header.
It is a specific firmware for TPM device, mine is an external TPM module with 14-1 pins.
It is not a BIOS module! My MSI motherboard has TPM 1.2 BIOS module into UEFI, this is another thing! This is the reason: my MSI motherboard with TPM 1.2 module "into" the BIOS sees the TPM 2.0 physical module on UEFI menu when I plug it, but it doesn't work on Windows, there is a lot of similar cases over internet.
Infineon flasher works over Windows and it sees the physically inserted module.
I need a "forced" downgrade to v4 (TPM 1.2). In my particular case, there is no file to downgrade from v5 to v4, it is not on official possible combinations (but I think we can force it).

For Infineon chip:

TPM 1.2 module - 4.x firmware
TPM 2.0 module - 5.x firmware

UEFI with TPM 1.2 needs TPM 1.2 module (4.x firmware)
UEFI with TPM 2.0 needs TPM 2.0 module (5.x firmware)

Sometimes TMP module is solder into the board, for example notebooks. Firmware update is allowed independently of motherboard.
Sometimes board brand updates UEFI TPM 1.2 to 2.0 support, so both BIOS update and firmware update are needed.
Sorry my English and I hope you can help me!

More info:

silvenga.com/upgrading-firmware-infineon-tpm/

@maxdarksol Now, with this all information, can you help me modding the file that I need?

The chip that has my TPM module:

infineon.com/cms/en/product/security-smart-card-solutions/optiga-embedded-security-solutions/optiga-tpm/slb-9665tt2.0/

I think these firmware are incremental rather than full, and FIPS firmware is different from common criteria, so we can't simply modify the version number to install incremental updates.
By the way, I didn't found the downgrade 1.2 firmware for FIPS.

Maybe you have the truth, I don't know if it is incremental.
This is a screenshot trying to modify the last version number.
I'm very lost with this...