First check your config.inc.php to see if the hashing mechanism is different than expected (md5 vs sha).
If this has not changed from the old configuration to the new configuration, what what the version of the old OJS instance? What is the version of the new install?
I checked config.inc.php and in twice files (old and new) encryption = md5
Our old version was ojs-2_4_6-0
Our new website version is ojs-2_4_8-0
My site was down last week. So I deleted my site information. Then I installed new OJS version
and in cpanel, I imported old site database. After this step, I saw that I can not login to the
site. Also I replaced old site files and images in new sites.
I try to use reset password section. but it don’t work. I tested some users and passwords, but
they don’t work.
i also cannot do that. what i do is after changed the installed=On to installed=Off.
got to the ojs site and there will be an upgrade option.
i upgrade from 2.2.4 to 2.4.8.
make sure you follow the instruction properly https://pkp.sfu.ca/ojs/UPGRADE