Is 4.XX un-downgradable??

I've had my pandoras battery (hard-modded) for quite some time now. It has worked for me several times, and have successfully completely downgraded numerous PSP systems.

Today, I got a call asking if I could do another one. I agreed, picked up the PSP, and started working on it.

I made the MMS and everything, put in my pandoras batery, and nothing happened.

I've made several attempts, and all has failed. Has anyone else tried downgrading that OFW? I even used my own 1 GB MS to make a MMS, and nothing.
Suggestions?

EDIT: The green light doesn't turn on, but it still worked for me previously nonetheless. Now though, it doesn't.

No idea, no one else has made mention of it that I know of.

you sure your battery hasnt lost its charge?

I tried charging it, but nothing.
I tihnk it's the battery >_<

Damn man =\ lol.

Woah! I've been here before! Deja-vu!

Occasionally, depending on what ms program you use it will "forget" to place certian files on your MS.

if your using the same MMS (same files just keep it on a seperate one) i would say its your battery. Shucks

i just keep a pandora battery and mms laying around so i never have to make one again... and i know they will work b/c i only ever change the mms to upgrade the DC

yeah me too. have to charge the battery every now and then though

Damn, I'm buying another battery today.

Should I hard-mod or soft mod it?

Softmod it,.