Marcelo,
thank you so much for guiding me, i managed to fix this and my host is operational again !
really appreciate it !
i downloaded the customide image and installed it using the next command
esxcli software profile install -d /vmfs/volumes/518cf9e5-8764b2dc-6494-e06995428d08/update/VMware-ESXi-5.1.0-Update1-1065491-HP-5.50.26-depot.zip -p HP-ESXi-5.1.0-standard --ok