Issue with Bistro firmware in triple build (missing modes)

Hi, I just built a pretty run of the mill Convoy S2+ triple.

(3) Nichia 219C on MTN MCPCB
MTN-17DDm driver with Bistro firmware
Both springs bypassed, using good quality 18350 and 18650 batteries (have both tubes). Also tried switching between metal and rubber tail pieces from two S2+ hosts.

What I am seeing is (what seems like) six modes, but three of the modes are off.

Click on - low
Press and release - medium
Press and release - high
Press and release - off
Press and release - off
Press and release - off

I cannot enter configuration mode because no matter how many times I turn the light off (15+), I cannot see the flashing to indicate config mode. However, I did manage to switch the order - from LMH, to HML but I still have three “off” modes. I can also get into special modes like 2 different strobes, if I medium press from the first mode. Has anyone seen anything like this? I am super confused.

Thanks for your help!

Sounds like the 7135 regulator may be bad.

I think it must be a hardware problem like you suggested. I hope MTN Electronics will let me exchange it.