Re: no suitable DMI file for the JTAC recommended Junos upgrade version for a SRX550
>> Since the exact version 12.3X48-D95 is not available in the public repository, you can install and update the nearest mat schema for the version 12.3X48-D95 i.e. 12.3X48-D90.2/. >> You install the schema for 12.3X48-D90.2/ and use this schema as default for your SRX device >> Post update also it will show as schema update needed, but it will work fine for now.
>> Dev./Engg team has not yet released the schema for D95/. Its pending as of now.
Regards -Animesh If this worked for you please flag my post as an "Accepted Solution" so others can be benefited.