I would like to know if any seedboxes works well with HDCorea or allows you to edit the hosts file because without the ability to edit the file, the box is unable to connect to the tracker url. Thanks in advance.

Use an editor like vim.

vim /etc/hosts
take the cursor to the end of the file
press a
type
url of hdcorea ip-address you want to point to //Same way you write in notepad or whatever editor you use in windows
Press Esc
Press ZZ //ZZ is different from zz

Now its done.

But you need root access for this.

Something you should know before doing this though.
Pressing a changes to input mode so you can edit the file and pressing esc changes it back to command mode where you can choose to write the file to disk. When you are in command mode (after pressing a), don't try to move the cursor to another place just write in one straight line. If you want to change the cursor position, change back to command mode by pressing esc once, then use arrow keys or h,j,k,l (left,down,up,right) +- also work as up and down.
To delete a character press esc and go to command mode use arrow keys or h,j,k,l to go to the character you want to delete and press x. After doing this again change back to input mode by pressing a.

And in hosts file the line <url> <ip> means when you try to go to the url you will be pointed to the given ip without trying to get it from your dns server.

dediseedbox.com technical support made the change for me in a few minutes and the tracker works just fine.