I bought a TinySA from the secure seller Eleshop B.V. Nevertheless, I am not so sure that it is an original. The following points: Switching on only works by toggling the power switch and when USB is connected it usually does not work. Even after updating the firmware, the firmware release date shows an old date, even if the firmware is actually up to date. Yesterday I had problems with the self tests. It could also have been due to the battery level which I unfortunately did not check and this morning after it has charged overnight the self test works again. Yesterday self test 1 did not work at first, later 1+2 and then later 1-4 did not work.