Mass update - Checkbox dont appear

I created a new checkbox field within Contacts module and put it under 'checked' as its standard value. The problem is all the records I had prior to this change are unchecked by default.

Im trying to mass update all records but there isnt any 'MASS UPDATE' checkbox when editing the field in Studio, so I cant mass update trought the module.

I noticed that another field I had created of the type Multi-selection checkbox HAS the Mass update option avaiable. But when I create something as the Single-selection checkbox the option simply isnt there.

P.S: Sugar 7.2.1