Really sorry to hear that. Can I offer one more thing to try? If you have a friend or colleague with an iOS device, download the Mooshimeter app on their phone and then connect to your meter from that. iOS’s BLE stack tends to be much more reliable and once the new firmware is on your Mooshimeter you shouldn’t have to update firmware again until you choose to.
If that doesn’t work and you’re want to mail your Mooshimeter in, we can flash it with new firmware. If you want to go that route please contact us over email, email@example.com