Here the fix, lease cofnirm if work for you:
edit wp-includes/default-constants.php
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define(‘FORCE_SSL_ADMIN’, false);
you see 2 lines, same like that change to true, save the file.
Now go and try login, if you no have ssl, you see error, just igore that.
Then edit again wp-includes/default-constants.php
change to flase again, save the file, NOW YOU SHOULD LOGIN AGAIN ! : )