diff --git a/pySim/transport/__init__.py b/pySim/transport/__init__.py
index e90ced6e..2ffb9c35 100644
--- a/pySim/transport/__init__.py
+++ b/pySim/transport/__init__.py
@@ -137,11 +137,12 @@ class LinkBase(abc.ABC):
         # xx is the number of response bytes available.
         # See also:
         if (sw is not None):
-            if ((sw[0:2] == '9f') or (sw[0:2] == '61')):
+            while ((sw[0:2] == '9f') or (sw[0:2] == '61')):
                 # SW1=9F: 3GPP TS 51.011 9.4.1, Responses to commands which are correctly executed
                 # SW1=61: ISO/IEC 7816-4, Table 5 — General meaning of the interindustry values of SW1-SW2
                 pdu_gr = pdu[0:2] + 'c00000' + sw[2:4]
-                data, sw = self.send_apdu_raw(pdu_gr)
+                d, sw = self.send_apdu_raw(pdu_gr)
+                data += d
             if sw[0:2] == '6c':
                 # SW1=6C: ETSI TS 102 221 Table 7.1: Procedure byte coding
                 pdu_gr = pdu[0:8] + sw[2:4]