Is this Bangle.js 2 bricked?

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user150524
Finally got out my Bangle.js 2 to play with today. Thought I'd gotten it upgrade to the latest firmware (2v15, via the app method), but it started randomly freezing the screen and requiring reboots. I couldn't even access further down menu items.

First tried doing a device reset. Then settings reset. Kept freezing. Ok, fine, let's try reflashing the firmware with the Device Firmware Upgrade method using an iPhone (see screenshot of phone from flash attempt).

Now it just flat out refuses to do anything but reboot back into DFU mode, with the same message (see attached image):
```
SW RESET
DFU ZV13

CHECK STORAGE
NO NEW FW
BANK0 INVALID
BTN1 = REBOOT
```
If I try to let it boot normally, it's the exact same message, just with a WATCHDOG header.

Is there any way (perhaps USB?) to wipe the device and try again or is it truly bricked?

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