Any puma7 firmware?

[occalifornia]

if anyone is planning to purchase a hitron 4582 unit for testing , just to let you know you will not be able to inject your working certs from older units from puma6 and down into this unit because it uses a total of 9. 4 are docsis 3.1 . But on the bright side you can take working certs out of a puma7 and use it on older modems ,but why would you .
root_pub_key
mfg_cert
mfg_key_pub
cm_cert
cm_key_prv
D3_1_cm_device_prv_key
D3_1_root_ca_cert
D3_1_cm_device_cert
D3_1_device_ca_cert

This is an interesting change. Is this because of DOCSIS 3.1 or because of the modem itself?