PSP OFFICIAL FIRMWARE 5.01 IS OUT!!!!
Here it's the changelog:
Download Link:The main function which is renewed with system software version 5.01
Using PSP®, when downloading the contents from PlayStation®Store, when you use the memory stick duo * of 8GB and 16GB, “empty capacity is insufficient”, that the trouble which has the case to which message can be indicated, cannot download was corrected.
* From PS3®, or the personal computer it accesses PlayStation®Store, when downloading the contents, the above-mentioned problem does not happen.
Click Here To Download It