Coder bpterson has released a password control plugin for EN/CFW 6.20 TN-E, 6.20 PRO-B7. This plugin will enable a password protection before entering the PSP’s XMB.
The usage is really simple:
Put passctrl.prx at ms0:/seplugins/ or ef0:/seplugins/
And add plugin path at vsh.txt.
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Source: spslimhacks