Boost Platinum no longer reports to any credit bureau. We recommend the following cards instead as an alternative rebuilder card.
Extra Card
Apply Here 
The Extra Debit Card is a Mastercard is a debit card that actually reports to credit bureaus (Equifax and Experian). It is better than Boost because it is a Mastercard and can be used anywhere and since it is a debit card, there is chance of you incurring more debt. There is also no credit check and approval rate is 99%.
Buy On Trust Lending
Apply Here
Buy On Trust Lending is an online electronics store where you can pick up your purchases from your nearest Best Buy store. There is no credit checks though you do need 3 months of income of at least $1,000 and a clean checking account. You can get up to $5,000 credit limit.