[SOLVED] Photon and HTU21D-F / I2C issue

[EricBrian]

@FistOfTheNorthStar,

Did you try what @mdma suggests here:

D0, D1 not working with Photon (suspected relay shield problem, was not)

Hello everyone, our apologies for this issue. We are investigating this and looking to find out how this has crept into our system. In the meantime, fix is available on the github releases page for 0.4.3 that you can install manually. Please follow the instructions there to update your system firmware to 0.4.3 and D0/D1 pins will become responsive again.