Hi! I'm totally stuck and can't figure out what's the problem. I have a 193B RNS-E unit that was previously coded for C5/4B before by the seller but I (in an attempt to enable AMI) coded it back to A3. Now I can't change the second digit back to "5" no matter what I do. By the way, AMI integration went well and I can enjoy full iPhone support which is amazing, menu allows to navigate through anything and everything including Audiobooks and Podcasts and of course the music collection. Here is what I tried so far: followed various instructions to downgrade the software, acheived partial success, software gets downgraded to an X--- version using 2009 US Nav DVD but that does not allow me to change the dreaded digit to "5". I tried burning CD-Rs of other years US DVDs (2006, 2007, 2008) and none of them would initiate the software update (I do all the proper steps, i.e. changing adaptation channel 97 to 1, etc). So only 2009 disk is accepted but it seems it is not old enough to allow the coding for 4B. Any other tips/hints how to accomplish this task? Everything works as it should, with the following coding other than proper wheel impulse/speed signal from the cluster to the RNS-E: 0309647 and all I want to do is to code the unit with 0509647. The car is 2002 allroad that has Bose, CD-Changer, Sat Radio, OEM BT and AMI Here is my configuration (before software downgrade): RNS-E: 8P0 035 193 B HW: H02 System SW index: 0230 HU/Navi SW version: V5751050 Boot version: V574100A Audio SW version: A5750022-021209 Text version: 580 After software downgrade: System SW index: X--- HU/Navi SW version: V5751050 Boot version: V574100A Audio SW version: A5750017-120209 Text version: 580 In Advanced identification menu of VCDS it shows software version X03 What am I doing wrong? Thanks very much!