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This problem is not related to fsc. You need vidilation ecu. It is possible to implement it offline with e-sys or ista. But you need get vidilation file from aos. Upload your CBB request file. I will download the CBB response file for you

I guess it should be vALIDation, not vidilation

On the subject: IMHO using ESys would NOT have made any difference. Most probably new firmware needs revalidation. You should do what ISTA suggests. Then choose to do validation manually and produce request file. ISTA will then save the file which you give to anyone with AOS access or dealer. And then you get the reply you choose to import it in ISTA and it will do the thing.

It is possible to do the same in ESys, but I don't know if it will produce the same file format as ISTA.