Yeah, this error is done by the file vshctrl.prx.
Go to recovery and access to the flash0 using usb.
In the kn there is a file called vshctrl, rename it to any name.
Shutdown the PSP and prove.
If the PSP not start rename the prx again to the name vshctrl .
If the PSP start with vshctrl renamed, prove to start the update.
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