Welcome to Vodafone Community
Build Id: MMB29M
Model: Vodafone Smart ultra 6
Android Release: 6.0.1
Android Version: VDF-995NB02-ZA10d
Vodafone UK wouldn't send out firmware on a one to one request basis.
Software updates are sent directly to phones software update section in batches.
You'll either need to visit a Vodafone Highstreet Store so they can send it away to their Repair Houses if the phone has failed in some way firmware wise or Google Search for what your looking for.
I wish you all the best with this situation.
Current Phone > Samsung Note 9 _512Gb > Model: SM-N960 Hybrid-Duos.
Samsung One Ui / Pie.
Samsung Gear s3 Frontier Watch.