diff --git a/i2c/I2C.py b/i2c/I2C.py
index 037725621622007f7019883d53ab1bfdf446d8e1..1abf950ecc4c569dd746cbee4ab8b467a9ab822c 100644
--- a/i2c/I2C.py
+++ b/i2c/I2C.py
@@ -33,6 +33,6 @@ def I2C1server(addr,data,reg=None,read=0):
        return True;
   except:
        if bus: bus.close()
-       data[0]=0
+#       data[0]=0
        return False;
 
diff --git a/i2c/setRCUversion.py b/i2c/setRCUversion.py
index bfe58a3ce177acf3fbcaf8ebba9ed1656b2f1af5..4b8d6e64f00e0360c97be994643ec7697b3d3432 100644
--- a/i2c/setRCUversion.py
+++ b/i2c/setRCUversion.py
@@ -1,20 +1,32 @@
 from I2C import *
 import time
-RCU=1
-Ver="RCU2L v1.1"
-R1=32
+RCU=3
+Ver="RCU2L v0.3"
+R1=0
 ROM=0x50
+
+#Set switch
+I2C1server(0x70,[1<<RCU],reg=None,read=0) #select RCU
+
+#Get ID
+ID=[0]*4
+I2C1server(ROM,ID,reg=0xFC,read=1) #select RCU
+print(ID)
+#exit()
+
+#Upload version
 Ver2=[ord(c.encode('utf-8')[0]) for c in Ver]
 print(len(Ver),Ver,Ver2)
 V2=[0]
-I2C1server(0x70,[1<<RCU],reg=None,read=0) #select RCU
 for i,v in enumerate(Ver2):
- I2C1server(ROM,[],reg=R1+i,read=0) #select RCU
- time.sleep(0.01)
- I2C1server(ROM,[v],reg=None,read=0) #select RCU
- time.sleep(0.01)
+ time.sleep(0.1)
+ I2C1server(ROM,[v],reg=R1+i,read=0) #select RCU
+# I2C1server(ROM,[v],reg=None,read=0) #select RCU
+ time.sleep(0.1)
  I2C1server(ROM,V2,reg=R1+i,read=1) #select RCU
  print(i,v,V2)
+
+#Download version
 Ver2=[0]*10
 I2C1server(ROM,Ver2,reg=R1,read=1) #select RCU
 print(Ver2)
diff --git a/rcu/HWconf.py b/rcu/HWconf.py
index 30ffd75868825a22ec16afec69e6b1f60a89437f..b2bbedcee85dddf8297f1914b9da6fd796f38dc7 100644
--- a/rcu/HWconf.py
+++ b/rcu/HWconf.py
@@ -45,8 +45,8 @@ RCU_HBA2=DevReg(0x42,0,0,2)
 RCU_HBA3=DevReg(0x43,0,0,3)
 
 
-RCU_ROM_ID =DevReg(0x50,0,0,0) #32 bit ID=4 bytes
-RCU_ROM_Ver=DevReg(0x50,4,4,0) #String
+RCU_ROM_ID =DevReg(0x50,0xfc,0xfc,0) #32 bit ID=4 bytes
+RCU_ROM_Ver=DevReg(0x50,0,0,0) #String
 
 #Bitbang devices
 #BBdev=namedtuple("BBdev","nPins devs pins addr")
diff --git a/rcu/RCU.py b/rcu/RCU.py
index e1ca7b121679d54d33afe9f8ff223883469c4956..037ce29dd196e3df3eee8ea56bbe72faa9901ae0 100644
--- a/rcu/RCU.py
+++ b/rcu/RCU.py
@@ -197,6 +197,8 @@ class RCU1():
             self.SetI2CAddr(self,dev)
             for RCUi in range(self.N):
                 self.SWcallback(1<<Vars.RCU_MPaddr.Switch[RCUi])
+                #for i in range(len(value2)): value2[i]*=0;
+                value2[0]=0
                 self.GetI2Cnoreg(RCUi,dev,width,bitoffset,value2)
                 value[RCUi]=value2[0]
             return value;