Question about Klipsch T5 True wireless

iPhone X, iOS 13.4.5, Klipsch Connect 1.2 genre, I would use the Klipsch Connect app, version 1.2. When connecting to the Klipsch T5s, the firmware update 3.9.5 is required. Unfortunately - in the first phase of the left T5 - I always get an error message after applying the update (100%) and the corresponding reboot. After the third time, I give up. Unfortunately, I cannot install the latest firmware update and the Klipsch Connect App with the fine adjustments cannot be used accordingly. Maybe there is a helpful tip ;-) Thank you very much for your feedback. Aldo Wipfli