Cool [Q] Disable signature verification with /sbin/recovery, possible?

I have a device, problem is that touch is NOT working and when I reboot it to recovery, I am unable to navigate because volume keys are not working with that.

I found that I can use /sbin/recovery to do the same tasks, but another problem came in. The zip I have is NOT signed, whenever I try /sbin/recovery --update_package=/sdcard/update.zip it says Signature Verification failed.

What should I do now? Can I disable signature verification with /subin/recovery commands?