Bluetooth error / BLE-Version 0.00

Problem:

Bluetooth connection error

Steps to reproduce:

every Bluetooth connection failed (add as new device or connect to garmin app, also with different devices)

Steps to try to resolve:

  • every step from FAQ Garmin Connect App Bluetooth Fehlerbehebung (with iPhone 15)
  • again every step of FAQ with different device (Pixel 6)
  • download / install garmin express + connect Lily to PC
  • Update process with garmin express
    • notification for new software "Lily Network Processor" (Version 2.90, size 199,95kB, changelog four times "NA")
    • press install -> new file "E:\GARMIN\REMOTESW\gup4109.gcd"
    • secure disconnect watch from PC
  • follow upcoming update instructions on the watch several times
    • show notification "Software-Updates sind verfügbar." Updates jetzt installieren?" -> yes
    • "Neustart"
    • garmin triangle
    • garmin update icon (gearwheel with arrow down)
    • garmin triangle
    • show notification "Bluetooth-Software wurde aktualisiert."
    • show still BLE-Version 0.00

Questions

Is there an way to download an install an older version / downgrade?

Why does the watch to try "Network Processor" with version 2.90, which was included in Lily Software Update - 8.10?

Device

Lily from 05/021 with S/N 6SF003003

SW-Version 12.21
BLE-Version 0.00
TSC-Version 1.21
Sensorversion 20.04
WHR-Version 5.00.05
BMX 5.0.5
Secondary BMX 0.9.1

Geräte-ID 3357690717