You need to run it yourself. WIth 2 Bs, it’s not likely a 4.29 either. The only way to hit that with 2 Bs is to have taken only 3 a-g courses some semesters.
If you were to have only taken 4 a-g classes per semester and received As all semesters for every class, and just 2 semesters of Bs, the best you can do is 4.25, assuming 8 semesters of honors/AP/IB. I’d be surprised if you took fewer than 4 a-g courses per semester.
Your grades also don’t say whether or not your Bs were just for a single semester. I suspect they were with an UW GPA, but I could be wrong.
I say this because schools re-run these. They don’t rely on your self reported grades. You want a very good handle of this number because at nearly every school it will be the number one factor they consider.