Devhook?

I hear from a couple of people I should get it, what is it and where can I get it?

just google this same exact name you just wrote. I don't know if I'm aloud to post the apps here.
What it does is it lets you play Any game AL the way up to version 2.60 and theres 3 games playable for version 2.70 without having to upgrade your psp. also you can use all the new features from firmware 2.60 web browser all that stuff soon to bee full 2.70 without having to upgrade.

Thanks I'll try it now

DEVHOOK 0.41b compatible information

plain20.prx / plain25.prx
+------------------------------+-+-+-+-+-+-+--------------------------------+
| function |1|1|2|2|2|2| note |
| |0|5|0|5|6|7| |
+------------------------------+-+-+-+-+-+-+--------------------------------+
|plain prx for modulemgr |x|x|O|O|x|x| loadcore direct / API patch |
+------------------------------+-+-+-+-+-+-+--------------------------------+
*use crypted files without patch
because plain file need more memory space as crypted file.

devhook.prx (devhook)
+--------------------------------+-+-+-+-+-+-+------------------------------+
| function |1|1|2|2|2|2| note |
| |0|5|0|5|6|7| |
+--------------------------------+-+-+-+-+-+-+------------------------------+
| uart Kprintf (reboot-start dh) |O|O|O|O|?|?| sysmem.prx direct hook |
+--------------------------------+-+-+-+-+-+-+------------------------------+
| uart Kprintf (after start dh) |O|O|O|O|?|?| sysmem.prx API hook |
+--------------------------------+-+-+-+-+-+-+------------------------------+
| redirect flash to MS |?|O|O|O|?|?| 'flash' io table hook |
+--------------------------------+-+-+-+-+-+-+------------------------------+
| file-UMD mount 'NO-UMD' |O|O|x|x|x|x| device entry swap , API hook |
+--------------------------------+-+-+-+-+-+-+------------------------------+
| file-UMD mount 'ANY-UMD' |x|x|O|O|x|x| direct patch , API hook |
+--------------------------------+-+-+-+-+-+-+------------------------------+

devhook.prx (MsReboot)
+---------------------------+-+-+-+-+-+-+-----------------------------------+
| |1|1|2|2|2|2| note |
| function |0|5|0|5|6|7| |
+---------------------------+-+-+-+-+-+-+-----------------------------------+
| reboot from FW1.50 |x|O|O|O|x|x| loadexec/reboot.bin direct |
+---------------------------+-+-+-+-+-+-+-----------------------------------+
| reboot from FW1.00 |x|x|x|x|x|x| can't load FW1.50 loadexec.prx |
+---------------------------+-+-+-+-+-+-+-----------------------------------+

prx20.prx
+------------------------------+-+-+-+-+-+-+--------------------------------+
| function |1|1|2|2|2|2| note |
| |0|5|0|5|6|7| |
+------------------------------+-+-+-+-+-+-+--------------------------------+
| enable 2.00/2.50 crypt prx |?|O|-|-|-|-| API hook |
+------------------------------+-+-+-+-+-+-+--------------------------------+

note:

FW 1.51,1.52,2.01,2.60,2.70 are no try.