We're letting the word out that Dark AleX has just released Custom PSP Firmware M33-3. This new build carries with it some error fixes and improvements to enable it to work with an equally new Popsloader version also in circulation. Quoting the readme:

* Fixed synchronization issue that plugins check code caused in PSN NP9660 original games (fixes 0x80010013 error)
* Added a couple of libs to the nids resolver.
* Added some internal changes required by incoming 3.80 popsloader plugin.

The new popsloader doesn't appear to be too different from the previous version - it was simply re-worked to carry support for M33-3. Keep in mind that it's built specifically for the third update - it won't run on previous 3.80 M33 versions. As always, we strongly advise users to view the file readme before they attempt to install either M33-3 or its accompanying popsloader.