Backend log in after disabling frontend login because of migration

[Benneth]

Owing to migration reasons from Dspace 5.0 to 7.4 currently going on, we disabled all front end login's.

Please, I need help to achieve the following task:

1. How do I download a collection that is huge, from the backend(terminal)

2. For the collection to be downloaded, which table can I get the collection number.

3. How do I download restricted collections from backend

4. Remove all occurrences of login text from all pages(home page etc)

Help on any or all of the above will be appreciated.

Thank you.

Benneth