This occurred to me as well, though it bricked all three of the hose timers I tried it on, including two that were brand-new in-box.
Orbit has warrantied them as they were all within the 2-year purchase time limit, but it’s sad to throw them out.
The symptoms I had was a “failed” update status on my phone, with a hose timer that kept flashing white every 2 sec (indicative of a pending firmware update), despite all attempts to reset or wait it out (overnight didn’t help). The hose timer was visible by Bluetooth, but couldn’t be turned on/off.
With the warranty credit, I’m upgrading to the Gen 2. Hopefully they work better.