If a student has requested that an item attempt be reset due to a technical issue, as the instructor you will be able to reset attempts at your discretion.
For information about allowing multiple attempts for assignments, resolving student issues with tests, and deleting or clearing grades in Blackboard, see the topics below:
Delete or Clear Grades: https://help.blackboard.com/Learn/Instructor/Original/Grade/Grading_Tasks/Override_Grades
Resolve Student Issues with Tests: https://help.blackboard.com/Learn/Instructor/Original/Tests_Pools_Surveys/Resolve_Issues_With_Tests
Multiple Assignment Attempts: https://help.blackboard.com/Learn/Instructor/Original/Assignments/Multiple_Assignment_Attempts