Ruined my Lumintop HL3A. Solved.

Cant get my HL3A to work after firmware update. I flashed latest FW3A fsm firmware and now light starts at turbo as soon as I touch tail to head and doesnt react to button.
Probably firmware is OK, and I messed something while soldering. My hands are very shaky.
It is also hard to put head together, because of small holes for wires.

Any ideas what I messed up?

Most probably a short of the black lead from the led-board with the body of the light.
That circumvents the driver, and it creates literally a direct drive to the led (AKA turbo).
Check if the black lead is damaged (you said tiny holes) and the copper wire is touching the body.
Or look for a solder blob that is a fraction too big.

I changed wires, an cleaned excess solder from joints. Light works, but now it blinks in off state with almost moonlight levels of light, much like candle mode mixed with lightning mode. Its not stable in on state too, flickers randomly sometimes…
Is it still shorting somewhere, or I managed to damage driver?

Sorry, can’t help you with that. I own an FW3A and know of the most common issues of that type.
The HL3A is a close relative of that light, but it has no separate body and tailcap, like the FW3A has.
There a a few simple rules to follow when assembling an FW3A.
But I’m not familiar with the “little” things you need to pay attention to when owning an HL3A.

One more time cleaned everything, changed wires to 0.25mm2 (a bit thinner), flashed latest anduril with no fet option. Light is working again.

Bumping this because working on my HL3A right now. Did you have any problems with the switch? I wanted to remove the driver, but figured that with the small holes for the wires, I better leave it alone. Pushed the driver back in, tightened the retaining ring, but now my light isn’t reacting to the switch. It even sent random signals, my HL3A turned on and started to ramp while in my hand.

Check again if driver is aligned properly.

The solution was to tighten the retaining ring holding the driver really, REALLY hard. I didn’t manage to get the driver out though, the two cables won’t make the 90° turn so I could pull out the driver.