Sketch not "taken" after flashing?

Hi Everyone,

I now have another photon exhibiting the same symptoms as before

I think it’s related to putting 0.7.0 rc1 and or rc2 on them?

I have tried to get it working with a DFU downgrade to 0.6.2 > part2 > bootloader (forced?) > part1 but I still end up not being able to actually flash OTA, although all prompts and status LED messages seems to indicate successful OTA update.

Any ideas on how to get back up and running?

Thanks

Andy