<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def update(self, **kwargs):
 """Due to a password decryption bug we will disable update() method for 12.1.0 and up """

        tmos_version = self._meta_data['bigip'].tmos_version
        if LooseVersion(tmos_version) > LooseVersion('12.0.0'):
            msg = "Update() is unsupported for User on version %s. " \
                  "Utilize Modify() method instead" % tmos_version
            raise UnsupportedOperation(msg)
        else:
            self._update(**kwargs)