from Total_Noob:

-This version of CXMB works for custom firmware's:3.71-5.50
-Its a Full version so you can also use it to make ctf's,
make sure you use the right decrypted prx (paf.prx, common_gui.prx, vshmain.prx)
from each firmware

[install]
Copy contents of folder: CXMB_full_all_cf to your memorystick.

[Previous versions credits go to]

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To Alien
寫給外星人
Hello World

CXMB 3.2.1 for 3.71m33/3.80m33/3.90m33/4.01m33 by Poison

[CREDITs]
Thanks to Matchung, Gilleco, Aeolusc, Real.KK, SilverSpring, SchmilK.
Thanks to everyone who has contributed to the PSPSDK.
Thanks to everyone who has contributed to PSP CFW.