https://community.hpe.com/t5/operating-system-hp-ux/need-immediate-help/m-p/3572007#M228329 Hi,<BR /><BR />System.prev is not the kernel file. Try long listing using ls -l and then try by booting through appropriate kernel with names like vmunix.prev or vmunix.old.<BR /><BR />HTH,<BR />Devender Tue, 28 Jun 2005 05:35:49 GMT Devender Khatana 2005-06-28T05:35:49Z https://community.hpe.com/t5/operating-system-hp-ux/need-immediate-help/m-p/3572006#M228328 After installing Secure Path 30d? without removing 30C my HP-UX 11i v2 gone down. Now it doesnt boot. How to boot properly previous version of kernel from EFI?<BR />I have errors when doing it:<BR /><BR />Press Any Key to interrupt Autoboot<BR />\EFI\HPUX\AUTO ==&gt; boot vmunix<BR />Seconds left till autoboot - 9<BR /> Type 'help' for help<BR /><BR /><BR />HPUX&gt; ls<BR />backup boot.sys bootconf bootfs current<BR />hpux_test import.config ioconfig kernrel krs<BR />last_install lost+found nextboot rootconf system<BR />system.import system.prev system1.05.2004 vmunix<BR /><BR />HPUX&gt; boot system.prev<BR />Couldn't read ELF header.<BR /><BR /> kernel loading failed<BR /> Tue, 28 Jun 2005 05:06:07 GMT https://community.hpe.com/t5/operating-system-hp-ux/need-immediate-help/m-p/3572006#M228328 Igor Sovin 2005-06-28T05:06:07Z https://community.hpe.com/t5/operating-system-hp-ux/need-immediate-help/m-p/3572007#M228329 Hi,<BR /><BR />System.prev is not the kernel file. Try long listing using ls -l and then try by booting through appropriate kernel with names like vmunix.prev or vmunix.old.<BR /><BR />HTH,<BR />Devender Tue, 28 Jun 2005 05:35:49 GMT https://community.hpe.com/t5/operating-system-hp-ux/need-immediate-help/m-p/3572007#M228329 Devender Khatana 2005-06-28T05:35:49Z