An issue was found with the SD CARD on the 10x developer units produced earlier. It just wasn't reliable. This has been delaying us for weeks now, trying to get it resolved. The chipset manufacturer hasn't been very helpful, and it has been very hard to get them to recognise the issue and engage to help resolve it. The issue seems to be a fundamental compatibility issue between the external SPI flash memory we are using and the SDIO SD CARD hardware interface. We are not sure if it is just a circuit issue (interference, bus timing, etc), a library issue in the SDK, or something more fundamental. The good news is that the chipset manufacturer has now engaged and is actively working on it - they ordered some custom PCBs to try to recreate the problem, which they received a couple of days ago. We're expecting to hear back any hour/day now; not going to hit that manufacture button until 100% certain the issue is in software (not hardware).
This SD CARD issue is the final issue we've identified. Everything else is ready to go. Timeframe for OVMS v3 to be available on FastTech is 14-to-21 days after the SD CARD issue is resolved.