2.8x Why the need to use dump psar?

Anyone know why its neccesary rather than having it already dumped and working on any PSP? Only thing I can think of is, 2.8x has firmware for specific regions where as older firmware worked for all regions.

From QJ:

2.71
Firmware 2.71 06/01/2006 19.2 MB

2.82
PSP Firmware 2.82 CN 1009 10/26/2006
PSP Firmware 2.82 AU / NZ 1002 10/26/2006
PSP Firmware 2.82 US 10/26/2006
PSP Firmware 2.82 EU 1004 10/26/2006
PSP Firmware 2.82 Korea 10/26/2006
PSP Firmware 2.82 JP 1000 10/25/2006
PSP Firmware 2.82 RU 1008 10/25/2006
PSP Firmware 2.82 MX 1010 10/25/2006

Has anyone used my 2.82 installer that is not in the US and got it to work? Cos the 2.82 DataPsar I included is from the US eboot.

What do you mean by "Why the need to dump psar?"