quick question

I have an upcoming LH flight on July 15th and I am trying to use any instrument available to upgrade
the tix was issued by a customer and I had no say on the booking class which limits my options to M&M and PPB.

Flight is showing
F3 A3 J9 C9 D9 Z9 P0 G9 E9 N0 Y9 B9 M9 U7 H3 Q2 V1 W0 S0 T0 L0 K0

But no availability in I or R so far

any recent experience when LH opens up prior to scheduled departure?