I tried many times with the iOS app. After some time the log message will change and say
Checksum (Offset = 3712, CRC = C0890C67) received
CRC does not match!
The watch will still be stuck at the DFU screen.
I've now borrowed my company's Android phone. Initially, I tried to flash the firmware with the Web IDE in Chrome. It looked promising at first and the progress bar kept progressing, but at the end it got stuck.
I've then installed the NRF Toolbox for Android and with it I could finally flash the firmware and restore the watch.
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