hi, the 3.7 is quite a major step up in the E1 software architecture. I am currently testing it before I make it available to the testers (or whoever) on beta.electra.one. I was hoping to have it there already but issues were found. I expect the 3.7 to be available on beta reasonable soon (1 week). The public release will take longer as I want 3.7 to go out with the bootloader update orchestrated by the controller firmware - I need to be super careful with that one as a failed bootloader update may brick the hardware.