download firmware to downgrade

Hello,


a couple of days ago my watch started having problems. First the LEDs on the heart rate monitor went out, then the barometer, it started to heat up until the battery ran out in 2 hours. Sometimes the touch panel doesn't work. I've made everything, wipe data, hard reboot, soft reboot, test mode... nothing.


I would like to downgrade the firmware since I have version 8.50 but I can't find a way to download it. Does anyone know where I can download previous firmwares?

Regards

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