@Rivash_S - Hi and Welcome - not sure about this one but lets try a few things
1 on the underside do the green lights still work?
2, check the battery level on dashboard
3, connect it as if to recharge - do you see the battery symbol or charging icon
you may also want to try to restart your device (this can take upto 3 attempts to completely reboot) (Note - this is a restart not a factory reboot) to do this follow this link and choose the device you have
https://help.fitbit.com/articles/en_US/Help_article/1186
if it still doesn't work you may have to contact customer support
https://help.fitbit.com/?l=en_US&cu=1&fs=ContactUs&co=GB
Please note if this is not the country you are from scroll to the bottom of the page and you will see United Kingdom and a down arrow - click the down arrow and select your country for the support page relevant to your area
Hope this helps
Kind Regards
Wayne
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