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new (3 weeks old ) Forerunner 645 & Big Black screen Issue ( video attached )

Hi all,

I bought the new forerunner 3 weeks ago (after 5 years with polar) in order to run :
- next saturday the midnight bangkok marathon
- next month the vietnam mountain marathon

Since 2 days it s impossible to use my watch : take a look on this video https://youtu.be/TKUyluvYxd8

I did an hard reset but still the same

What I'm supposed to do now .... ?

I need your help and a watch for saturday ....