Banglejs 1 will not boot

[nujw]

After recent update to firmware 2v25 my bangle.js 1 refused to boot. No matter what combination of buttons it always returns to a screen showing :
BOOTING
BTN1 = REBOOT

Dropped back to 2v24 using nRF Connect and it still does the same thing. Now unusable.

Is there a way I can factory reset or get it to boot? After hours of searching nothing I have found can get me past this point.

Thank you.

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UPDATE : After 2 full days and many many repeated firmware uploads of 2v23, 2v24 and 2v25 it has suddenly come back to life on 2v24 !! Absolutely no idea what might have happened and why it suddenly decided to do something different.

[gfwilliams]

Glad it's fixed now! Not sure what might have caused that - generally holding BTN1 down while booting will stop Bangle.js loading anything from internal storage and will go straight to the recovery screen no matter what, so I imagine for some reason the firmware update failed and didn't 100% complete the upload.

Were you uploading from iOS? I know after we shipped Bangle.js, iOS issued an update that caused bootloader problems, so while the new bootloader would be ok, the one that's almost certainly on your watch keeps disconnecting part-way through when trying to update on iOS.