The JGAurora A5S and A1 are new printers released in October 2018. They feature a new 32-bit motherboard developed in-house by JGAurora, using Allegro A5984 stepper drivers with 32x microstepping, delivering much improved printing performance over their predecessor, the A5. Both of these printers also feature smart features like power outage resuming, and filament run out sensors. The A5S and A1 printers have large print volumes of 300x300x320 and 300x300x300 respectively.
For information on upgrading the A5S and A1 firmware, please see this page.
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The “download” port on the motherboard contains a JTAG SWD interface, but the pinout is completely non-standard. this will help anyone who wants to flash:
Connect this port up to an ST-Link V2 using jumper wires / dupont cables, and you will be able to backup and upgrade the firmware on the A5S & A1.