Instead, she contacted the company's asset management archive. They kept a "digital vault" of legacy firmware images for exactly this situation. She found a CD-ROM image from 2012 containing the last known stable release: SMR880_Firmware_v2.04.hec .
Erasing underlying bugs caused by corrupted system files after a major upgrade. Prerequisites for Flashing smr880 firmware
If your device is "bricked" (frozen or stuck in a boot loop) or in demo mode, standard OTA updates may not work. How to Flash new Firmware to your Android Smartwatch smr880 firmware