Pod Go Edit prompted me to update the Pod Go to 2.0.0. I consented.
After update showed complete in Pod Go Edit the unit showed only "Updating..." for 20 minutes, at which point I came here to see that this is a common issue. When I power on the unit normally, it locks up at the POD GO splash screen and shows Firmware 1.40.1.
Attempts to fix using Line6 Updater / DFU mode (Page >):
confirmed that PC has no sleep/hibernate function enabled (it is always on)
reboot Windows 10 machine, and confirm in Task Manager that nothing audio-related is running; in fact nothing is running at all besides Line6 Updater
connected Pod Go to multiple different USB ports on the back of the machine (not hubs or front of machine)
confirmed that no audio hardware is connected to PC
confirmed that Pod Go has no connections besides power and USB
tried two different USB cables
tried Line6 Updater online mode for both 2.0.0 and 1.4.0 and offline mode for 2.0.0 and 1.4.0 (downloaded files)
Line6 Updater always fails. Note that the windows "usb disconnected" sound occurs on the "Update In Progress" screen (first screenshot), immediately after the transition from "Downloading firmware update image" to "Installing firmware update..."
Factory reset (C+D startup) and Clear settings (A+B startup) result in the relevant message on the splash screen but the unit still locks up there.
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RESOLVED
I had another unused windows 10 machine sitting around, so I did this:
confirmed that nothing is running on the machine at all, besides windows processes
no connections on PC besides power, keyboard, and mouse
downloaded/installed Line6 Updater and Pod Go (latest versions) which include Pod Go drivers
connected Pod Go via USB (no connections on Pod Go besides USB and power)
powered on Pod Go in DFU mode (Page >), windows gave the "usb connected" sound
confirmed in Device Manager that the Line6 device was there; listed as "DFU"
ran Line6 Updater
attempted online install of 2.0.0 firmware: FAIL - same error as the other machine
attempted online install of 1.40.0 firmware: SUCCESS - Pod Go boots up as normal before this fiasco
DON'T TOUCH ANYTHING JUST YET - DON'T CLOSE UPDATER - DON'T TOUCH Pod Go - if you still want to upgrade to 2.0.0 firmware...
As I now knew that I could successfully rollback to 1.4.0, on this specific machine, using this specific process, I decided to try the Line6 Updater again (never closed it from before, never opened Pod Go Edit on this machine at all, never touched the Pod Go unit) to online install 2.0.0 firmware: SUCCESS
Line6, there are definitely some kinks to be worked out. Given my tech-savvy, and spare machine, I'm guessing that a lot of folks aren't willing or able to go through the trial and error that I did. Perhaps some official guide on workarounds (or a software fix) would be in order.