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The direct download links for your cell phone depending on your security that you have to revive with odin.
Download Galaxy Watch 3 Firmware Update SM-R840
Installation for roms with 5 files via Odin
To Download current Odin or previous versions compatible with your device
Extract the firmware you just downloaded. You must obtain 5 files:
1- System & Recovery (AP)
two- BL (Bootloader)
3- CP (Modem / Radio)
4- CSC _ *** (Country / Region / Operator)
5- HOME_CSC _ *** (Country / Region / Operator)
Add each file to its respective field in Odin vx.xx.x.
Use CSC _ *** if you want to make a clean flash or
HOME_CSC _ *** if you want to keep your apps and data.
How to Open Download Mode on SAMSUNG Galaxy Watch3 45 mm – Flash Mode