Unable to flash MDBT42Q with either Native WebIDE or Chrome - board now locked and unusable [SOLVED #13 post]

Ahhh, but I followed the instruction:

"Normal Firmware Update"
"Just click the button below and follow the on-screen instructions."

re: 'Not really...'

Why provide the trap at all? Any beginner will follow the same instruction for 'Normal' as did I.

nRF-Connect doesn't recognize the device either.

So, . . .

Tried online Web Bluetooth Secure DFU from post #9 from link in post #1 above

but don't even make it as far (32768 bytes) as @AkosLukacs did (270336) in post #10 same link

Might be relevant 32768 == 0x8000

From Chrome console when stalled: DOMException

found DFU service
web.html:140 found 2 characteristic(s)
web.html:140 found packet characteristic
web.html:140 found control characteristic
web.html:140 enabled control notifications
web.html:140 transferring init
web.html:140 init packet already available, skipping transfer
web.html:140 transferring firmware
web.html:140 written 32768 bytes
web.html:1 Uncaught (in promise) DOMException

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