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Just received two A10 500's and I'm having a world of problems with both of them.

One of the A10's (A10L, g19 controller, firmware: a10l_20200715_061347) has zero accepted shares and continues to generate 100% rejects.  I have tried different ports on the control board, different data cables, different PSUs, etc.  Even when resetting the miner and having it auto-tune with the default pool settings, I can't get any accepted shares.  It was working before I installed the firmware (originally upgraded firmware because I had problems connecting but later realized it was a network/router issue).

The other A10 (A10, g19 controller, firmware: a10_20200628_082241) continues to auto-tune over and over about every 60-90 minutes once it hits around 400MH/s...I can't get it to complete autotuning and just hash like normal.  Any suggestions?

Also, does anyone have firmware from June-December 2019 available?

Type: A10L
Controller Version: g19

For the Zig Z1+ - I installed 20181116 and am only hashing around 6.0-6.2 Gh/s between 800-925Mhz...not consistent rates across different pools...have done the soft resets, pulled the power and waited, etc.

Of the four firmware releases - 20181015, 20181029, 20181105, 20181116 - is there one in particular that seems to be the "best" from a high hashrate and consistency standpoint?  I'm considering flashing back down to an earlier version, but would love to save the time if anyone has thoughts here.

I tried using a coupon this morning but I was about $20 short of BCH because the price moved on me right as I went to place the order.  Because I was unable to pay, the order expired.  Does anyone know if the coupon will eventually be put back into my account or did am I just out of luck and lost it?