I have seen other makes which have described how to do this but you do need the manufacturers instructions. These are frequently obtainable from their web site but in this case I couldn't find any.
However, if you go to their web site (www.breitling.com/zh/index.php#/home/), you will see on the left side of the screen a heading "maintenance centers", click on this and choose the one nearest you.
If you contact them they may be able to talk you through the procedure or send you a set of instructions.
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