[Samsung Galaxy Watch] RobinGB:
After reading all of this thread and running through the procedure several times before being successful I have tried to build further (more details) on the posts so far made by others...

The procedure below is known to have worked for at least several people (including me) if your Samsung Galaxy Watch Active2 (SM-R820) has Tizen version 4.0.0.6. It worked for me changing from French CRC (XER) to UK CRC (BTU) on Tizen 4.0.0.6. After I followed the procedure below my watch started up in English (not French as it did out of the box) and then a few minutes later asked me to let it update itself to Tizen 4.0.0.7. All seems to be working perfectly.

If you have Tizen 4.0.0.7 please check this thread (e.g. post #76) for further info.

NOTE: The Links in this post are for SM-R820, DO NOT USE THE FIRMWARE FILES IN THIS POST FOR ANY OTHER VERSION

Note: To check what CRC you need, see on site Droid Views "how-to-change-csc-in-samsung-galaxy-phones"

Note: I used this procedure because I live in the UK and I wanted the Silver (shiny) Stainless Steel version of the watch, but Samsung UK have only released Gold and Black! Note Samsung UK, your colour choices are very poor! Samsung make the range of colours because that is what people want, choices. OK, sorry folks, unhappy customer rant over, back to why I needed to use this procedure...

So I bought on Amazon a French version of the watch (Samsung France have released all colour variants from what I can see). When I received my watch (as new from Amazon) I turned it on, changed the language to english, ran through the watch process to set it up (connected to Samsung Wear app on my phone etc). However, I did not allow the watch to update itself. It told me there was a software update, but I did not install it. Once the watch had finished setting itself up and I was happy it seemed to be working properly and wasn't faulty, then I then tried to setup Samsung Pay. This is where like everyone else I found I couldn't register my UK bank cards to the Watches French Samsung Pay service (terms and condition etc are all in French and it rejected my cards). So that is when it was confirmed for me that if I want to use Samsung Pay in the UK with my UK bank cards I needed to change the CRC to the UK one = BTU. So I started the procedure below to change it from French CRC (XER) to English CRC (BTU)...

Step#0: Charge your watch to >90% charged

Step#1: Download 'NETODIN' https://xdaforums.com/attachment.php?attachmentid=4382735&d=1515359315

Step#2 Download SDBStarterKidv1 from https://xdaforums.com/attachment.php?attachmentid=4338152&d=1511255266

Step#3: For model R820 download Combination Firmware https://xdaforums.com/sho...81&postcount=8

Step#4 For model R820 download Stock Rom (same link as Step#3) https://xdaforums.com/sho...81&postcount=8

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#12a: In NETODIN select options and turn off (untick) AUTOREBOOT.

Step#12b: Click on AP in NETODIN and select the file from the combination firmware, when NETODIN has finished checking the file, press the start button.

Step#13a: once you see pass status in NETODIN press the reset button

Step#13b: In NETODIN select options again and again turn off (untick) AUTOREBOOT

Step#13c: Select CSC and select the CSC file located in the STOCK ROM file, press start button

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 to access the recovery options menu

Step#15: go down so "recovery" is selected and then hold down 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 (hold home key until it powers off, then hold home key again till it restarts)

Step#19: open SDBStarterKidv1.zip and extract content. Open the folder data/tools and run ansicon.exe. This will open a CLI = Command Line Interface

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

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

you shall see connected to

Step#21: Type: sdb root on

Step#22: Type: sdb shell

Step#23: Type: 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. If you do not knwo what CRC you need see on site Droid Views "how-to-change-csc-in-samsung-galaxy-phones"

Step#25: hit escape key

Step#26: Type: : (yes that is a single colon, no spaces, don't type this text, just the single colon)

Step#27: Type: wq

Note: Ignore any error about can't write to a file XXXX where XXXX is not the file we are editing. If you want to check your change was saved you can re open the file and you should see your changes already exist

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

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

again ignore any error about writing to another file

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=1017159]tb_[/MENTION]

[MENTION=1030585]adfree[/MENTION]

[MENTION=10234061]hashirajaz94[/MENTION]

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

Hope that helps you RobinGB