In form, that displays the checkbox do something like this:
def __init__(self, *args, **kwargs):
    super(FormName, self).(*args, **kwargs)
    if self.instance and self.instance.checkboxfieldname != None: #we check 
if this form has instance and if checkbox :
        attrs = {'checked':'checked'}
    else:
        attrs = {}
    self.fields['checkboxfieldname'] = forms.BooleanField(widget = 
forms.CheckboxInput(attrs = attrs))

should work.
alan

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