Here is a new version of portable VNC working with all firmwares (but not 2.7 )
What's new in this version 1.2.1 :
+ Modify wifi connection handler to work on 1.5FW
+ Check wifi switch on startup
** Many thanks to KingPSP to help me to test it on 1.5FW ! **
Thanks also to Yoyofr, Bigal90 and DeMoN X for their help.
My contribution on this app is minor (only code rewritting to fit new interface of PSPSDK, and copy/paste wifi code from psp-ftpd). I just wanted it to work on my PSP 2.5.
Portable VNC is distributed under GNU licence, and sources are provided with the archive.
Hope that helps, :)