I currently have 2 ACX1100's doing the same thing:
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 0 0 0 90 17 0 0 20 0
(da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI Status: Check Condition
(da0:umass-sim0:0:0:0): MEDIUM ERROR asc:11,0
(da0:umass-sim0:0:0:0): Unrecovered read error
(da0:umass-sim0:0:0:0): Retrying Command (per Sense Data)
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 0 0 0 90 17 0 0 20 0
(da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI Status: Check Condition
(da0:umass-sim0:0:0:0): MEDIUM ERROR asc:11,0
(da0:umass-sim0:0:0:0): Unrecovered read error
(da0:umass-sim0:0:0:0): Retrying Command (per Sense Data)
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 0 0 0 90 17 0 0 20 0
(da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI Status: Check Condition
(da0:umass-sim0:0:0:0): MEDIUM ERROR asc:11,0
(da0:umass-sim0:0:0:0): Unrecovered read error
(da0:umass-sim0:0:0:0): Retrying Command (per Sense Data)
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 0 0 0 90 17 0 0 20 0
(da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI Status: Check Condition
(da0:umass-sim0:0:0:0): MEDIUM ERROR asc:11,0
(da0:umass-sim0:0:0:0): Unrecovered read error
(da0:umass-sim0:0:0:0): Retrying Command (per Sense Data)
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 0 0 0 90 17 0 0 20 0
(da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI Status: Check Condition
(da0:umass-sim0:0:0:0): MEDIUM ERROR asc:11,0
(da0:umass-sim0:0:0:0): Unrecovered read error
(da0:umass-sim0:0:0:0): Retries Exhausted
when attempting to install from recovery usb i get the following:
Hit [Enter] to boot immediately, or space bar for command prompt.
Type '?' for a list of commands, 'help' for more detailed help.
loader>
loader> install file:///jinstall-ppc-12.3X54-D10.6-domestic-signed.tgz
cannot open package (error 22)
Currently having 2 devices that are bricked and unrecoverable via usb recovery I'm kind of at a loss.
Did you ever resolve your issues?