I'm so sorry about this friend. Truth is, scholarship is never guaranteed. It's a nice thing to get it, but you should be prepared to foot your study bills in the event you don't get funding. Like
@Naturgrl said, to get a study permit, you'll need to show that you have enough personal funds to cover tuition and all other expenses.
BU is really a small town school (small in size but still a great DLI) and mainly undergrad-focused so their funding is primarily for undergraduate studies.
What is your GPA? You might be able to get funding at other schools for Fall 2021 if you've got great grades, but you need to hurry.