Whats the Latest Firmware from 5.00 m33-6?

[Xplict91]

I havent used my psp in a long time, but I been seeing some many interesting things lately but Im still at 5.00 m33-6 whats the latest firmware from this to let me play the latest games without a update.

Forgot to add

Im running a Psp 2000

[jxx2005]

5.50 GEN-D3
is the newest firmware

but as for dark-alex firmware

there are no new ones and will not be any new ones