Hate to say it but I believe the issue with TI is real and not a user issue. My RX200 is Hardware V1.00 with Firmware v1.08. Initially the device never displayed the new coil message when I attached a tank using TI mode. I have been reading the forums and someone posted about firing the mod with and without a tank attached. I fired the mod with the button the tank off the attached the mod and fired a few more times. Also switched between modes a few times then finally got the new coil message. Selected new coil and the unit worked like it should (Just like my IPV4). Unfortunately the story does not end here. If I leave the mod alone for a little while I have to repeat the process to get TI temp control to work again. Additionally I can not use the lock function because i will not get the new coil message if the resistance is locked. Sent a couple of emails to Wimsec service but no responses yet.