diff --git a/requirements.txt b/requirements.txt
index 9749d7fd..eb82114b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,3 +15,4 @@ git+https://github.com/osmocom/asn1tools
 packaging
 git+https://github.com/hologram-io/smpp.pdu
 smpp.twisted3 @ git+https://github.com/jookies/smpp.twisted
+smpplib
diff --git a/smpp_ota_apdu2.py b/smpp_ota_apdu2.py
index f4fcb904..7166dc20 100755
--- a/smpp_ota_apdu2.py
+++ b/smpp_ota_apdu2.py
@@ -138,5 +138,5 @@ print("initialized")
 #f.tx_c_apdu(h2b('80a40400023f00'))
 #f.tx_c_apdu(h2b('80EC010100'))
 #f.tx_c_apdu(h2b('80EC0101' + '0E' + '350103' + '390203e8' + '3e052101020304'))
-f.tx_c_apdu(h2b('00a40000026f0700c0000000'))
+f.tx_c_apdu(h2b('00a40004026f07' + '00b0000009'))
 f.client.listen()