Does Xperia™ Companion software find unbranded ROMs?

Hello. Sorry if this is a silly question; first time Xperia user here. Does the Xperia™ Companion software find unbranded ROMs that don't come OTA? I have a UK o2 Z3+ and want the latest official Sony stock debranded ROM. Could you tell me if the Xperia™ Companion software would download this for me or will it only bring up carrier-modified ROMs as if I were to check OTA?

Thanks!

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