[Samsung Galaxy Watch] hashirajaz94:
Step # 1: Download 'NETODIN' https://xdaforums.com/attachment.php?attachmentid=4382735&d=1515359315

Step # 2: Download SDB http://download.tizen.org/sdk/tizenstudio/official/binary/sdb_2.2.89_windows-64.zip

Step # 3: For Model # R820 download Combination Firmware https://xdaforums.com/showpost.php?p=80340381&postcount=8

Step # 4 For model R820 download stock rom from link in Step #3

"Make sure your watch is 90% or above charged"

Step#5: Keep on holding the Home button on the watch till you see Rebooting popup appears

Step#6: Immediately start pressing the Home button until the recovery option appears

Step#7: now press Home button again to drop down to "download mode (wireless mode)

Step#8: now hold the Home button again for some time till the black screen appears

Step#9: at the download mode screen now again press home button again until connection type changes to AP

Step#10: check your wireless network in your computer, you will see a new open network will appear showing model number of your watch, connect your system to that network

Step#11: Now open NETODIN and you will be able to see that NETODIN shows connected

Step#12: click on AP in NETODIN and select the file from the combination firmware and make sure you have unticked AUTOREBOOT option before pressing start

Step#13: once you see pass status in NETODIN press reset, select CSC and select the CSC file located in the STOCK ROM file , also make sure you unchecked autoreboot before starting

Step#14: once you see pass status in the NETODIN, hold the Home button on your watch until you see rebooting splash and repeat the STEP#6

Step#15: drag down to recovery and keep on pressing the HOME button until black screen appears

Step#16: your watch shall start normally and after that go to settings in your watch turn on wifi and connect to your wifi network, just search for IP their and note it down

Step#17: go to about and software "third item written in blue color of two characters most likely" locate software and continue tapping on that until you see some popup appears

Step#18: restart your watch

Step#19: open SDB folder in your computer open data folder and then tools , run ansicon

Step#20: sdb connect ***.***.*.***

ps * indicate your watch ip which you have written in step #16

you shall see connected to

Step#21: sdb root on

Step#22: sdb shell

Step#23: edit /csa/csc/csc-active-customer.inf

you will see something written at your screen in this way

csc

~

~

~

Step#24: press i on your keyboard and replace the three alphabets representing your current csc to your desired csc code

Step#25: hit escape key

Step#26: type :

Step#27: type wq

Step#28: edit /csa/imei/prodcode.dat

Step#29: Repeat step# 24,25,26,27

ignore any error

Step#30: repeat step# 5,6,7,8,9,10,11 just don't untick autoreboot this time

Step#31: select BL,AP and CSC from the stock rom

Step#32: Delete the galaxy wearable app and plugin and then unpair your watch from the phone

Step#33: after NETODIN shows pass, your watch should start normally and you should be able to connect your watch to mobile

all credits and thanks goes to
[MENTION=1030585]adfree[/MENTION]
[MENTION=1017159]tb_[/MENTION]

ps: don't put on charge your device for few minutes due to overheating.