Can't login to administrator back-end, No error message - Joomla! Forum - community, help and support

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hi,

website: http://www.ditsem.net
joomla!: 3.4.5

i wanted update newest joomla! 3.8, front-end template or didn't support it, because graphics interface dissapeared after update. did logical thing , restored backup before update.
however can't login back-end of website. no error messages given, nothing happens page refreshes , shows login screen again. went _users db , reset login , passwords. i've tried messing permissions log files , tried upgrading again hoping fix back-end problem. no such luck.

please help

how did revert backup? have deleted current files before reverting backup? have reverted database? need remove current site, , revert 3.4.5 filesystem, , revert 3.4.5 database.





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