L1B to L1A and EB1 eligibility

I am on L1B and its valid till 11-Aug-2016. My L1B extension is denied now. My GC in EB2 has i140 approved.

If i apply for L1A and if its approved, can i upgrade my GC from EB2 to EB1 category?

Hello LearninHuman. How did it go? Were you able to get a GC? Please share your experience