Yes, exactly, we have to finalize the hardware first.
A lot of things are still in flux and we have to start negotiating these with hardware manufacturers and supply chain. Currently we have a lot of balls in the air to juggle. The SAR will depend on the modem choice and on the case design as well as antenna design and positioning. This again can only be done and completed once we have kind of a final mainboard design.
We are currently targeting end of April / beginning of May to have first designs, but this can still change if we get more i.MX8 delays. Currently we do not even have full datasheets for the CPU since NXP does not release them to the public yet, announced date is now February 2018. We are confident that we will be able to use the i.MX8 but it makes our schedule extremely tight.
We do the best we can but are limited to what we find on the market. We have contacted almost 100 potential manufacturers, just to give you an idea on what we are working on here. We will have to narrow this down in the next couple of weeks, fly to Asia, talk to a narrowed down number of them, choose one, start the design with them taking into account their supply chain etc.
As I said before, we will have an eye on the SAR and will do the best we can to reduce it to a minimum but we can not give any number before we have a first prototype and having it measured in a lab.