{
	"@odata.context": "http://portal.xpertdoc.com/odata4/v6/$metadata#TemplateVersionsHistory/$entity",
	"TemplateVersionHistoryId": "00000000-0000-0000-0000-000000000000",
	"TemplateId": "00000000-0000-0000-0000-000000000000",
	"Version": 1,
	"AssemblyBlobFileName": "Template.dll",
	"SourceBlobFileName": "Template.docx",
	"Metadata": null,
	"CreatedByUserProfileId": "00000000-0000-0000-0000-000000000000",
	"CreatedDate": "2016-01-01T00:00:00.0000000Z",
	"ModifiedByUserProfileId": "00000000-0000-0000-0000-000000000000",
	"ModifiedDate": "2016-01-01T00:00:00.0000000Z",
	"Timestamp": "AAAAAAAEqKE="
}

var templateVersionsHistory = portalContext.TemplateVersionsHistory.Where(tvh => tvh.TemplateVersionHistoryId == Guid.Parse("00000000-0000-0000-0000-000000000000")).FirstOrDefault();	
	
templateVersionsHistory.AssemblyBlobFileName = "New Name";
templateVersionsHistory.ValueToChange = value;

portalContext.UpdateObject(templateVersionsHistory);
portalContext.SaveChanges();