Dark_Alex has released popsloader for custom PSP firmware 5.00 m33-2. Pops loader is Playstation One Portable Station that loads games intended originally for the Sony PSX console onto the PSP. Popsloader is described as an emulator. which allows the use of games designed for other consoles and/or platform such as PC, in this case the PSP console and PSX games.  The emulator makes use of the PlaystationPortable hardware and certain modules which allow for almost seamless play of almost all of the playstation one catalogue on the portable. This is possible because the portable uses software to render the games found originally on the PSX.

5.00 M33-2, it won’t work in 5.00 M33-1

New:
- Works on 5.00.
- Added 3.80, 3.90 and 4.01.

- Upgrade from older version of popsloader:

* Copy seplugins to memstick root folder replacing files.
* Dump 4.01 (choose decrypt all option in psardumper) and copy the file impose.prx in /seplugins/popsloader/ with that name (impose.prx, without numbers)

- Install from scratch:

* Copy seplugins to memstick root folder replacing files.
* Dump the desired firmware to extract the files needed. (choose decrypt all option in psardumper)

Thse are the files needed for each firmware:

3.02-3.03: /kd/pops.prx, /kd/popsman.prx, /kd/meaudio.prx, /vsh/module/pafmini.prx
3.10-3.30: /kd/pops.prx, /kd/popsman.prx, /vsh/module/pafmini.prx
3.40-4.01: /kd/pops.prx, /kd/popsman.prx, /vsh/module/pafmini.prx, /vsh/module/libpspvmc.prx

* Copy the files to /seplugins/popsloader with firmware version as suffix (e.g. popsman.prx -> popsman380.prx)
* Additionally, no matter which pops you want to run, you have to get impose.prx from 4.01 and
copy it to /seplugins/popsloader/ with the name impose.prx (no suffix).