After successfully applying the firmware update, the touch screen no longer enumerates on USB. I tried different PCs with different operating systems with the same result. I repeated the update procedure and had the same result. The touch screen was working correctly prior to the firmware upgrade.
Output of firmware upgrade procedure:
Opening DFU capable USB device…
ID 0483:df11
Run-time device DFU version 011a
Claiming USB DFU Interface…
Setting Alternate Setting #0 …
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 011a
Device returned transfer size 1024
DfuSe interface name: "Internal Flash "
file contains 1 DFU images
parsing DFU image 1
image for alternate setting 0, (1 elements, total size = 13764)
parsing element 1, address = 0x08008000, size = 13756
Download [=========================] 100% 13756 bytes
Download done.
done parsing DfuSe file
Turn off DFU switch, unplug and replug device, then:
$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 05ac:1402 Apple, Inc. Ethernet Adapter [A1277]
Bus 001 Device 010: ID 0557:2213 ATEN International Co., Ltd CS682
2-Port USB 2.0 DVI KVM Switch
Bus 001 Device 008: ID 0557:8021 ATEN International Co., Ltd CS1764A
[CubiQ DVI KVMP Switch]
Bus 001 Device 006: ID 047d:1020 Kensington Expert Mouse Trackball
Bus 001 Device 003: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 009: ID 1366:0105 SEGGER Bus 001 Device 007: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 004: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 015: ID 1366:0101 SEGGER J-Link PLUS
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub