diff --git a/wr_esc_sn.py b/wr_esc_sn.py
deleted file mode 100644
index 2979a1f..0000000
--- a/wr_esc_sn.py
+++ /dev/null
@@ -1,88 +0,0 @@
-#!python2-32
-from __future__ import print_function
-from sys import exit
-from py9b.link.base import LinkOpenException, LinkTimeoutException
-from py9b.link.tcp import TCPLink
-from py9b.link.ble import BLELink
-from py9b.link.serial import SerialLink
-from py9b.transport.base import BaseTransport as BT
-from py9b.transport.packet import BasePacket as PKT
-from py9b.transport.xiaomi import XiaomiTransport
-from py9b.transport.ninebot import NinebotTransport
-from py9b.command.regio import ReadRegs, WriteRegs
-from py9b.command.mfg import WriteSN
-from time import sleep
-
-
-#new_sn = "16133/00101234"
-#new_sn = "N2GTR1826C1234"
-
-def CalcSnAuth(oldsn, newsn, uid3):
-	s = 0
-	for i in xrange(0x0E):
-		s += ord(oldsn[i])
-		s *= ord(newsn[i])
-	s += uid3+(uid3<<4)
-	s &= 0xFFFFFFFF		
-	if (s & 0x80000000)!=0:
-		s = 0x100000000-s
-
-	return s % 1000000
-
-
-#link = SerialLink(dump=True)
-#link = TCPLink()
-link = BLELink(dump=True)
-
-with link:
-	print("Scanning...")
-	ports = link.scan()
-	print(ports)
-
-	#tran = XiaomiTransport(link)
-	tran = NinebotTransport(link)
-
-	#link.open(("192.168.1.45", 6000))
-	link.open(ports[0][1])
-	print("Connected")
-
-	print("Pinging...")
-	for retry in xrange(20):
-		print(".", end="")
-		try:
-			old_sn = tran.execute(ReadRegs(BT.ESC, 0x10, "14s"))[0]
-		except LinkTimeoutException:
-			continue
-		break
-	else:
-		exit("Timed out !")
-	print("")
-
-	
-	#lock
-	#tran.execute(WriteRegs(BT.ESC, 0x70, "<H", 0x01))
-
-	old_sn = tran.execute(ReadRegs(BT.ESC, 0x10, "14s"))[0]
-	print("Old S/N:", old_sn)
-
-	uid3 = tran.execute(ReadRegs(BT.ESC, 0xDE, "<L"))[0]
-	print("UID3: %08X" % (uid3))
-
-	auth = CalcSnAuth(old_sn, new_sn, uid3)
-	#auth = 0
-	print("Auth: %08X"  % (auth))
-
-	try:
-		tran.execute(WriteSN(BT.ESC, new_sn, auth))
-		print("OK")
-	except LinkTimeoutException:
-		print("Timeout !")
-
-	# save config and restart
-	tran.execute(WriteRegs(BT.ESC, 0x78, "<H", 0x01))
-	sleep(3)
-
-	old_sn = tran.execute(ReadRegs(BT.ESC, 0x10, "14s"))[0]
-	print("Current S/N:", old_sn)
-
-	link.close()