Anyone know where I can download previous versions of the D3 firmware? I only started noticing problems when I upgraded to the latest November version.

Also, has anyone here had success replacing defective hashboards through Bitmain? I e-mailed one of the reps and they pointed me to this website, https://shop.bitmain.com/user/repairHeader.htm. When I go to that site it asks me to provide a carrier/tracking number. Am I supposed to just send the hashboards back without getting prior approval? I thought I needed approval from Bitmain to open the machines up and take the hashboards out? Or do I just send them out and fill out the repair ticket form after?

Any help would be much appreciated!