Editing ICAL Exploit

== Introduction ==
ICAL Exploit was Created by [[SilicaAndPina]] allows for System Uri Calling on the latest PSVita firmware [[3.73]]
as well as a bug with the PSN Sign Up application, that allows for Account Switching also on the latest PSVita Firmware [[3.73]]

== System URI Calling == 
(system uri's are URI's defined in param.sfo surrounded by triangle brackets. and they can only be run by the system and not the browser)  
The PSVita [[Calendar]] Application allows you to create ical event files in the (.ics) format, which is an .INI-Like format with ':' instead of '=' for defining values.
these files can be sent over PSN Messager and the EMail client, to execute SUPPORT_URI's you simply have to write the uri you want into the ics file's URL: entry and then view the event either in the Email Application or the PSN Messager application and click the "www" browser icon.
*Note: You CANNOT use the Calendar application itself to do this, it must be done in the event preview screen found in Email or Messager apps  
you should be able to do this in any Text Editor.
Here is an example .ics file (run package installer)
  
    BEGIN:VCALENDAR
    PRODID:-//SCE Inc//PSVitaCalendar 0.00//EN
    VERSION:2.0
    BEGIN:VTIMEZONE
    TZID:106
    BEGIN:STANDARD
    DTSTART:19700101T000000
    TZOFFSETFROM:+1100
    TZOFFSETTO:+1000
    RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=4
    END:STANDARD
    BEGIN:DAYLIGHT
    DTSTART:19700101T000000
    TZOFFSETFROM:+1000
    TZOFFSETTO:+1100
    RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=10
    END:DAYLIGHT
    END:VTIMEZONE
    BEGIN:VEVENT
    UID:2017100712075551579
    DTSTAMP:20171007T121157Z
    DTSTART;TZID=106:20171007
    DTEND;TZID=106:20171008
    SUMMARY:Package Installer
    SEQUENCE:6
    URL:psgm:play?titleid=NPXS10031
    END:VEVENT
    END:VCALENDAR
A website for easily exploiting the libical bug mentioned can be found at http://vitatricks.tk
(src code: http://bitbucket.org/SilicaAndPina/vitatricks)

== Changing PSN Accounts ==
If you re-run the signup app via the 'psnreg:' uri call after you've already got an account linked then the SignUp application will say
"Please Wait..." and then take you to the "Welcome <yourname> to PSN" screen, however if you remove internet access to the console at the correct time using the "Please Wait..." screen then PSN Authentication will fail. and you will be booted back to the "Sign In" screen, from here. you can sign in using any credentials your vita will be linked to this account. however `ux0:/id.dat` is NOT updated. so you'll have to go back to your original account before rebooting or you'll be greeted with the "Please format your memory card" message