Here’s something new !
It fixed and update the old plug in but can’t install new plug in always says, “The plugin does not have a valid header.”.
Any comment ?
Amazing, don;t know the reason, but it worked in that way.
Deleted upgrade folder >> created again >> given 777
and it worked.
Before that it was not working even I had all my folders with 777 blog/wp-content/upgrade.
Ok, At last it worked