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Problems with connecting my smart citizen device to the the SD card and wifi

hi, I am experiencing problems with connecting my smart citizen kit to any wifi connection (it simply does not appear in on my mobile) and the SD card. oit had worked once before, but now the wifi-mode is showing a fast pace blicking blue light (Error - not collecting data).
Have any of you had the same problems? And how did you solve it.
I have tried to restart, re-install and more, but none of that seem to work.
best,
Gudrun