note: on some chips it is possible to downgrade TPM firmware from 2.0 to 1.2 depending on manufacturer support. Or you could pitch in and make AEM compatible with 2.0?.
Based on my experience, you should temporarily install Windows 8.1 instead of Windows 10 to do these updates. While I did not have to downgrade the TPM on my unit (as it was already 1.2), my unit did have a TPM firmware update available. Due to changes in how the TPM is handled in Windows 10, I had to clear and then re-own the TPM using the tpm.msc program built into windows 8.1. Make sure to backup the owner password at the end of the ownership process (as the update utility will ask for it) and then run Panasonic’s firmware update utility.