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Did Vodafone UK supply the phone @MATT_LINTOTT86 ?
Also try using the Smartswitch Samsung software to update the phone.
Please be wary of using a custom Rom as these can in some cases lead to an unstable phone or even worse unusable.
A Samsung Experience Store or Samsung Service Centre maybe able to update the phone to the latest that Vodafone have signed off too.
Current Phone > Samsung Note 10+ 5G _256Gb > Model: SM-N976B.
Samsung One Ui 2.1 / Android 10.
Samsung Gear s3 Frontier Watch.
Samsung Galaxy Buds.