U-Bolt Pro
In September 2020 I installed Firmware: 01.55.0020. This version of the code caused the inside/interior Red LED to flash once a second when the bolt was in the UNlocked state.
Battery life declined significantly.
I replaced batteries (after using an external battery checker) on
9/28/2020
12/1/2020
1/8/2021
Also on 1/8/2021 I installed Firmware 02.07.0020. As hard as it is to believe, since that day, 1/8/2021 until now (5/11/2022) , the same set of Duracell batteries are still installed and show a status of High.
At this time I have no plans to update the firmware and will remain on 02.07.0020
PS. I keep a note inside the battery compartment with battery replacement dates.