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hp 1x4sw usb&ps2 KVM firmware upgrade problem

mlynx
Occasional Visitor

hp 1x4sw usb&ps2 KVM firmware upgrade problem

Product Number :438612-001,
Product Number: AF611A
Serial Number :MY2734CMR6
I have got a hp kvm switch four port usb/ps2. All i want to know how to update it's firmware because i have a problem with KVM its mouse port not working hp recomends firmware upgrade.
The firmware upgarde port is 9-pin serial connector on the back of the kvm switch (i
think it is RS232 type)and we download (hp 1x4sw usb&ps2 v1.3.121.exe firmware upgrade utility.
when switch connect to system with serial cable and run this firmware upgrade utility it dosent recognise or detect KVM switch to attach with serial cable. serial cable is non HP.
any one provide this KVM serial cable connection diagram or any other suggetion for solving this issue.