HP DS20L - Manual (Page 71)

Operation 3-27
update
The update command writes new firmware to the module. Then LFU
automatically verifies the update by reading the new firmware image from the
module into memory and comparing it with the source image.
To update more than one device, you may use a wildcard but not a list. For
example, update k* updates all devices with names beginning with k, and
update * updates all devices. When you do not specify a device name, LFU tries
to update all devices; it lists the selected devices to update and prompts before
devices are updated. (The default is no.) The -all option eliminates the update
confirmation requests, enabling the update to proceed without operator
intervention.
CAUTION: Never abort an update operation. Aborting corrupts the firmware
on the module.
verify
The verify command reads the firmware from the module into memory and
compares it with the update firmware. If a module already verified successfully
when you updated it, but later failed tests, you can use verify to tell whether
the firmware has become corrupted.